Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe33010b805730c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 20:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f93e90963d2b7c089af93480fd8a845 SHA-1: 8014da4deab63bff65f976214edb18219fab5b14 SHA-256: 4fe33010b805730c4cc16bea28c796eeefee1a2cc4f81eeb616c51f441eab2bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories. The presence of numerous links on disposable hosting further supports a malicious purpose, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161408455d13c9---zaxanovotera.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/sixemiwatanaduvabumagiwi.pdfIn PDF document text
    • https://europartner2.pl/uploads/jixamo.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/wowosur.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/72369422432.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/munila.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/26023553845.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/37904283484.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/legulinovezarenawovo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161400c0dcaf00---64989358761.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/80334096685.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/82098287182.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c3070889---184864037.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/35668569691.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/lakafakexugiv.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1e531218---20605615232.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/elf14fgcfjqkq3nohjats6af1d/41998244286.pdfIn PDF document text
    • https://businesslife.com/content/files/70670758291.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/7565361086.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/orh9jbe3mvr6hp4591e2uqjlh7/25705122178.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/66248200749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ram+dass+be+here+now+pdf+onlinePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/sikaxalovin.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 18636 bytes
SHA-256: 0bc57fef6e3efff22681928e735911399851164e7e1a830d9901a6bb5a7187c8
font_01_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 10936 bytes
SHA-256: 808f3a4f2aeff3757616586f5e3d4d58fd476f0d87987caf324da43fd3235910

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