Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c24e86b442ad89c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 11:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d7af867bfb8974614133435ac37f184 SHA-1: c5af4bdf6ecda76b2e3a53345695b3ddc0af8231 SHA-256: 9c24e86b442ad89ced3d5ab685cc4809d8b684eb1cfd4ce67a13b814ddcd9fbf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://medvor.ru/uplcv?utm_term=migatronic+pi+200+user+manual PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b687c8bf38---rononasapulekebotuxober.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a635afc6b---mavoguzujoliba.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/22544126908.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/1293986381.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/12979456761.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/43619251763.pdfIn PDF document text
    • http://dgjst.com/upfile/file/keduzudokewoxafa.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/5012388595.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/29970551145.pdfIn PDF document text
    • http://computerdoki.hu/user/file/83963600352.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tefevesajo.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/7640367489.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2abbe101e7---92614988115.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/lekimedidotuxonajipobis.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mks9alf8rnkjtcge3e0pktbv63/dafowoduraxedoligasoko.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/af3r19kajf4v5oa9cregghrlb7/powokupeget.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/67105009985.pdfIn PDF document text
    • http://termocity.by/pics/files/96632615629.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/filimomodugelamijukox.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/fipewizivoj.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e84be5fd6a1ef5531eef9845da629c6d/vajog.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/81648113809.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/wojepawitanosate.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/vetanasujasegigak.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16744 bytes
SHA-256: 32d383da6911c9efe2c557f44975abc24376878b80a24a69bc464b8c85f35905
font_02_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 11052 bytes
SHA-256: d7c3a287687b66c19512e9d0c182d438e4f52130c884243e81e47f21e667aaf9

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