Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b909a56d6a32d99…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 16:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2606d2925ada7b24e068512bbba639e6 SHA-1: 6afb3d05e8f1b536381bf6fe85db2edff53c7fb1 SHA-256: 2b909a56d6a32d991c6e334d62c3aafc0de7b7ba9ad2e5966258304ac536c440
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://rzn-house.ru/upload/file/vimezugofi.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/lepabewewiv.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/feluvedudibasumivipuxazi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gonapegogetujamelitutul.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/69483777966.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vorotadomibabawukilez.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/xesibemanopiwaxurotovotov.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/zepifipojotulu.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/tuwerupedonekubijokojuj.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nejevezilobagowo.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/faninodir.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/4610781559.pdfIn PDF document text
    • http://sbkf.org/files/files/jozuvulonolekovixuzodo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161326e7104bb2---7212220976.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/burajugupaxurogazi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fitevifufaxibaxuvu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133339d24585---81276413570.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jawagemeke.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574c98369e---45087405964.pdfIn PDF document text
    • http://gptools.net/userfiles/file/54583165710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=villa+rotograph+plus+service+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 16600 bytes
SHA-256: 5e0722945917477498f53799b55a2ecf408203773e5bba2b102ddc789efc1d26
font_02_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 20884 bytes
SHA-256: 61faf32cf398e0e6f70c3ba0e295c1cf029c386e4ac63577d288ceee48684306
font_03_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 10956 bytes
SHA-256: f8f0059e360b071c58ff44017dd6a727648a6989b75d19ba75fad639ef8316cb
font_04_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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