Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5daf4e33d6e633…

MALICIOUS

PDF

128.1 KB Created: 2021-06-25 17:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1de96b44e04d70edafd4a0c6ab7dec02 SHA-1: cea3f1b59372ba6a4e3f08e53449b3ef3b6829c8 SHA-256: 4d5daf4e33d6e633ec1d35a9e4f766375f254c44db5160cfe4eb90bb82108c32
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PRC/3D content is unusual for a typical document and may be used to exploit vulnerabilities or obfuscate malicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9024

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://drukarnia-skawina.pl/app/webroot/media/files/51835449218.pdf In PDF document text
    • https://securitegenerale.tn/userfiles/file/71866930356.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6e76a962be5a054275ad7d94f2cd1d92/jakopolugo.pdfIn PDF document text
    • https://renault-service.com/userfiles/bikiposel.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/tujenimidojipuk.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/munutixeloxil.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083714fc9ae4---wepebulexu.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/56dedb6abc2405248a9d2667656c4602/nomagexipeposurego.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03b8eaeec---susapi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/p06mnrshtaffk02b1kuea1sqi7/najowozupunopipuwigexinu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6043344a32ad7b010f7629d4cd1e7c03/32697150374.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/69150388029.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3238cddf---33061836693.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/afc29877b90e06af99cf250558b4fbd1/vuvuwufowepexinalefariv.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef13e8d32c---38547130170.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/70007633650.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772d9b4ffe3---56635489575.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/43067983040.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc21ab91d---32196901216.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/jivigapemedizikewul.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/49583109721.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/mofamamojupiramediriwugop.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ab8de9cc---19390084661.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210292209394.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4h6v1sb9mn0g3pcgq26t1ok096/salagolisazonibobovu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766cf66dcff---8717058828.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974ec46b7bd---xepibipibili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mohenjo+daro+discovered+byPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014f10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F10 25168 bytes
SHA-256: 37a72f2680602e12c3152668d62333fbc64a430958ae40b2b3ecb0f97253c77c
font_00_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 21712 bytes
SHA-256: 876628af7adb79245c460e191b9510a670341ac085ba1517c17c91954b76c706
font_03_sfnt_off00017c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1C 32544 bytes
SHA-256: d5bdc4c2a3505450357e33811b33971f90eba60fc33b31aa21d1558fd40aac67
font_04_sfnt_off0001d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D776 10764 bytes
SHA-256: 21f2b82798cbdd13743a42cd18bd5c484affe2628551e02aabc6ada1f8b580c5

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