Malicious PDF — malware analysis report

Static analysis result for SHA-256 c388a9b6f591ad47…

MALICIOUS

PDF

98.4 KB Created: 2021-08-15 02:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f92819c7f3eeeb91ef257ce9bac5791 SHA-1: 2c7e3a768818620cd4bd947755f881dcd701ef44 SHA-256: c388a9b6f591ad47ae8a0c1ddc4b1b458ce27d6b2f4e443c02e67f30c8da9ebb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. While no scripts were extracted, the presence of numerous embedded URLs, some pointing to compromised CMS uploads, suggests an attempt to redirect users to malicious sites or phishing pages. The document's structure and heuristic firings strongly indicate a social engineering attack aimed at tricking the user into a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://acm-medicali.it/userfiles/files/99207622406.pdf In PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/1111984828.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/sumalipeduwu.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/rusufidopimudujezafelawi.pdfIn PDF document text
    • http://sparkpro.lv/content/file/leraruseguva.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/90251924447.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wunog.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/14869109772.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ebd66446b3dd74a68c21d2e143d44fbb/69442545108.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/gilawoxopigojemoz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ef5cf0112---zutasewimato.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/faxite.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/sijukitupuwukobuzeselazi.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e9j2o3os11ho7ku8l27up3r18s/75066621143.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/nebes.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9bf582ef88804ea911ce600a443a34e7/jaraxifal.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fijaleritidabor.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/xaxujutiravodafobitifeb.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1ec4d0f8---6565891562.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165765c5b29---86085918834.pdfIn PDF document text
    • http://trevorhannant.com/piziwida.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/52423d2k11ade7e2bj0al1k4t4/woxiparulebovobagodabomo.pdfIn PDF document text
    • http://orem.mn/uploads/files/76439928884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=financial+accounting+9th+edition+libby+solutions+manual+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/disabodoruzo.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_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 17596 bytes
SHA-256: 1c6b63c22c84ff5eb4491d09531d5b32ecf1d582fa504d9b132ecd2afc2d5f11
font_01_sfnt_off000147a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB9 11468 bytes
SHA-256: d2a9063f7b8649aa11d27f0015d95cdbfb987b91e6f9575ee2b07fc21a318ae8

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