Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8041abed9be6f09…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 09:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 44c9deb90b3bd108f6cf0477e84a7c3b SHA-1: 450e41f10e78ecefcdf11ca5cf4eb082c4d20da9 SHA-256: b8041abed9be6f0928730c2795bff6117331fc308130fd50c9b81676179bc6c7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS uploads and a link farm suggests an attempt to redirect users to malicious websites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristics strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gemicilojistik.com/userfiles/upload/file/xiwumirifamomo.pdf In PDF document text
    • http://www.mostex.sk/files/articles/file/10741696586.pdfIn PDF document text
    • http://gr-chem.com/upload/files/54006216879.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/72785769158.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/kobejivegibikolurenunuj.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/79091426789.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/95177806535.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/jaxidirona.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/romugako.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/bowijosumedi.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/dipegolej.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481d15d7d3b---xidik.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/kigoxizu.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/limezafuworuboxijot.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d9298dbb5968b1175deda14f1f64bee1/sodedupi.pdfIn PDF document text
    • http://01host.ru/userfiles/files/31445804557.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/16341963838.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/waxovufudagisu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495ae48446d---votopuzajabikubegexabowo.pdfIn PDF document text
    • http://stroi-sistema.ru/img/83538205916.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/68703189760.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210918/file/kikerilivam.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/kifejiz.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/robasakosarunofomexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unity+zxing+qr+codePDF 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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 17744 bytes
SHA-256: 96fb3254e0e214d68594d6956d60ee2120e459985f224c44d6ec61d770ffed72
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 10600 bytes
SHA-256: e897ac18f82f97e8d4c0f40b0e5184d25da28d1d812d0848b2d0d7329642af53

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