Malicious PDF — malware analysis report

Static analysis result for SHA-256 55114ec8c25fa597…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 20:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a647eea4020ec688610eb7a7574bdf0f SHA-1: ad448536559c046558915f241f436b8f7c1c8d0b SHA-256: 55114ec8c25fa59734558e06d84c5a3c9534d8048f919f07dbb3c65c99904122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=kurs+angielskiego+dla+pocz%C4%85tkuj%C4%85cych+pdf PDF link annotation
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a0fb1108962e4b49afd9ce9b7f815b7/34418055238.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210822030358.pdfIn PDF document text
    • http://axwelindia.com/uploads/41707318291.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/lipapirerimirukimagaw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/15210263036.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/31570482360.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/dvr45buhsuso6vu8lpk0q3t99e/50535232558.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/10946523167.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd691df3d8---8357625997.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210606235647_c9744k.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/60641829006.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/simitedob.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/fonuwirexanezaruwijene.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d375cacc4fd---kefejaxanurovemaz.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wetobafugojusogogug.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wewikotub.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7vjqhbjocn6mv3ocifme10n0i7/59297992075.pdfIn PDF document text
    • http://dzbnf.com/upload/file///31869243788.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/nevikomosinenod.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b7601752---47984377282.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57670eee24---72683078451.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/remigijo.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/88596580801.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_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17920 bytes
SHA-256: 4cedeb7ed6b8053bace95e29fa4ccc77d2c9b56dbd807eee2eb528ac2e32990e
font_02_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 11624 bytes
SHA-256: cce787e0f6f6d6949c8a5351748d181e9632f70588e954a7e2f6e5c9d96cf94c

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