Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d9b1a59839af7f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 21:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f23da66ec361783b11b52458b2339c9 SHA-1: dabf91cbbf05ffac7286094170bd51709d94f39d SHA-256: b6d9b1a59839af7f532b9aa3d640f4bcc9013da488bbd54a97cb337066aff74b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=harry+potter+part+1+watch+movie PDF link annotation
    • http://galluccifaibano.com/userfiles/file/23174182336.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/67010870228.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/narigikasejetodavodamimu.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/86867228704.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/56460896484.pdfIn PDF document text
    • http://gibisch.biz/files/files/52343099021.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/nelajeliru.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/90652902275.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/nivetakavutekokidugadubi.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/413741069.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/josaririxi.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/15594586583.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614254c08c4d8---51269138213.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/57824173434.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/jovupibufifisugagaze.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/fibufenujej.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiweduxeletuji.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/90272734580.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/98ca54c8e2911dc55c6a2608b3480cbe/zovepulawe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335504143ac---2229312823.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/72684576422.pdfIn PDF document text
    • http://health-bridge.in/upload/file/44257783908.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/detapudomalaviv.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/80648287384.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210907_2775F22CC376C25D.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_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 10628 bytes
SHA-256: e86d887f2292087f5b6485145aeaed8b56ab1ece24555b503077cb1a09c44a6c
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 17984 bytes
SHA-256: 94cf09bf8b3b5482d6f44c954dd8df28a74fc2b808250674a8dea7c22d371a2c
font_02_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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