Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dea767f8729754…

MALICIOUS

PDF

84.9 KB Created: 2021-07-07 16:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1fa5de0a1f2280e45769dc3971ed4ec SHA-1: c6ef41f69afeb36c59fd80eea29ee58e0debbaa4 SHA-256: 80dea767f872975419c8a6c2c850c7faed462e499e01726b30c5b97a8f118c41
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Disable or Modify Tools

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to host malicious files. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in phishing and malware delivery. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609584b2a47ee---rulid.pdf In PDF document text
    • http://mtsskzy.com/userfiles/file/vonufamurapabawigav.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/68988099707.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/d2le4f3baiotb93ct7c2r06nvc/27181875833.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff9fd3d69---sorevipamiraris.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/63470078488.pdfIn PDF document text
    • http://guowangcable.com/d/files/ripomafugupenif.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85782abe6---12414454034.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/37028731137.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47381c571---mobobebaxodabazopato.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/56186451149.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/tomovozujulutivuno.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/baxadup.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gegujazozutajogawadifasi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tjcp0cef9fdtsq03msf4tl0ih3/vepoz.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/61119672330.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a9d5sm7rp0erjno9cecn4i66f1/ragigisonulewuduwabi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4690fac6c2---56616069445.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/99119546818.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780c3f06f5f---80146050361.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466d09834a---gowosejel.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/53048357459.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/71001012741.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee997d45224e52ec9914e6639c1ffebb/venukunafamomidubik.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/88375127203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=intrusive+thoughts+quizPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 17044 bytes
SHA-256: 52bec7adca48743844eb89cecb17a6ede1e1cec95082e1abd3349aadfac54705
font_01_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 10504 bytes
SHA-256: c441b726570486e9e6c91e9bd07b0a4344573b69e31c11c2eaf620583885ba51

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