Malicious PDF — malware analysis report

Static analysis result for SHA-256 4159141bbab8231e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 07:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f97a69916cdf13141938debb85585ca SHA-1: ea743fb58cc018fe0f9d78e1969eae98bc078ef5 SHA-256: 4159141bbab8231e71ff72807bfc645a45644eab0ec553e6b19e680d778f695f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous links indicates a redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3985d4c4---71273113088.pdf In PDF document text
    • http://allineers.morefriendship.com/upload/files/11487777036.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/vifimipupuvukepov.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/81000546773.pdfIn PDF document text
    • http://jljemc.com/upload/files/15855830609.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210911191113.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/51849637171.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/15594951653.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/bopokatakowafigilam.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/11463039803.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef2feaa6ae---wewubonosetixedumo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sawejututafimefifivukero.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a154d29---vibinitivu.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/47626291576.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/winakorupalud.pdfIn PDF document text
    • http://goldmustang.com/files/files/kujituvurojoxibibavetaz.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/mafexunazivu.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/vesenuwexe.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/segatugoxisiwaras.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/27137274026.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/kodasoxasedezedodu.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/54193826408.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/420951dc4ecfae3897d391e58046600f/putazulomufevanalajoko.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/79423465762.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/vigasi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/1519895659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=zip+app+androidPDF 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_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 17652 bytes
SHA-256: 611d55091252f45423c1799af81dc5ce23afc0bdf6689d07fd29262e751fb084
font_01_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 9904 bytes
SHA-256: 5481dfa4636a32cf41ebbfdb79505722a8f7ba137ef2f8d763107d10f5633843

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