Malicious PDF — malware analysis report

Static analysis result for SHA-256 729d1c8481ea4bb3…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 10:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1213c43e784aaf2cc32e79c7d65501c7 SHA-1: a40100367d362acad4b4ef39a3fc2bb3a9e97199 SHA-256: 729d1c8481ea4bb330f58e3114da540e7aaa321920284fd67a399bf17f3e8d1c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://fukaofoods.tw/uploads/files/202109030135263201.pdf In PDF document text
    • https://larustt.com/upload/ckfinder/files/58673246907.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bd477ceaf779e6c605876bf27663deac/sikunazek.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/53859866506.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/2628020801.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5f9355a915d02c87856e04d6d8282f2d/77960812760.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075824c8cc19---24523810856.pdfIn PDF document text
    • https://wrd13.com/force/file/95735522445.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/p0nmge9hdkdor8oq8f6c06d474/besuk.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jufalejolujose.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/11896179450.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4eaab92b72aebab6a161a44a1551f663/30853538269.pdfIn PDF document text
    • http://wohingltd.com/userfiles/68846875838.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/fubiwusijulepujakasimobim.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/11751807337.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125216d19b6a---82907099767.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/kimigovezepegipanavilan.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/najixufirere.pdfIn PDF document text
    • http://camonetinternational.com/files/file/4834579480.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebeb107189---zisexosovod.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/7431325424.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/dirodid.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/sanetofuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lista+phrasal+verbs+traducidos+pdfPDF 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_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 19440 bytes
SHA-256: acbd7d7dd82e02e956ec873272060be731499b0f6c20f0f3c614daff872178ef
font_01_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 10876 bytes
SHA-256: fd7ed13c7d8654b02f6aa4fb320a520eee2033c18f0748f382048dc56e18ea6c
font_02_sfnt_off000147bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1