Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e80c0cc0b1757d5…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 18:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43e7c94ab65fc41dce075841dd92cc05 SHA-1: a39f580f5a7a7adb4150ed261bf9fa0edb180d33 SHA-256: 8e80c0cc0b1757d54b83d0e2dfa9aa4ad38c8f2788c3f815ab2317636eede950
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=vasculariza%C3%A7%C3%A3o+do+sistema+nervoso+central+pdf PDF link annotation
    • https://fulzugaskozpont.hu/files/44028010096.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/552cec028792c39b5c707e151fdbc629/31335026560.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9ca288316---xudopolimizoxokulonogetol.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/baf0f142bdb3627bd31314fb53b59d50/gavemigaz.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/kbqeaa2a1n16k5ccntlkc63993/wivamobomujozixanimelera.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/juvazewewu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1hktnirqsroq83m7eeu1q051pc/77450918069.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/vogujun.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a3f2d00537b6209309085cd6e1d7684a/82401765795.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6c1ff1e05f405d7c9b283bcf4465da0e/wizuvapawuzixikejisija.pdfIn PDF document text
    • http://euroroma-bg.org/files/file/luzeroji.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r2hb9bi5tn3n55jkos9era3jfk/fifamevolimorezunipop.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/givaso.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/18798110913.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/50300167336.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/tobamilezifin.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/tugasumagigumixawoxir.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/50827530434.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/kumamidaroze.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160861e5903564---39775829085.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_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 11440 bytes
SHA-256: 28ba5a8d1319a03a5d66bcb31600831fb56810beec0fbcf264e794c7ceebbac2
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 20316 bytes
SHA-256: 6ef9019b6ccc858844ea1cca117c84526ef9ddcd22c450b8e39859b3b8121ee5

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