Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6c987726a34c2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 22:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f56b8ba893b8967333adfa441ed0bddf SHA-1: 1f4736484600f5a3619630f0ce47ca25629bd9eb SHA-256: 3ad6c987726a34c2450438cbd56c9b603704a660391b486f1a9a44c92657caf4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. Heuristics indicate these links are used for SEO manipulation and point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=love+and+sex+apk+download PDF link annotation
    • http://groupelamiri.com/uploads/FCK_files/file/58443956936.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lujulor.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/fipadulufaw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa7d126f---jevefinimagomejomojepe.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/nimuzepexugofofuxeviwalat.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/tubarofekubadoxebawu.pdfIn PDF document text
    • http://krupongs.com/images/file/17260746275.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/lipelurenesedisonukebewu.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/xovuzunesawogowure.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/67055741572.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/jotawukipugulurig.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/20176827696.pdfIn PDF document text
    • http://inica.org/files/file///biwinudopedelawakez.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/navokex.pdfIn PDF document text
    • http://prograsifkalip.com/files/12423769182.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/549e4710d98437fd56f727b4af2c7ca3/xisafa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ccbd90d7---34452125608.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7de5c854c2163efd25dcb0e56a726993/zivofererekuninelugutufow.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/bopakedafopidegafili.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/86e7f9dfe3fe77ad7d79593af38937cc/51211897715.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/80545084878.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/59693107721.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/17257073106.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/ritutemokumexujuzimovukum.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/vamugeridus.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/81501740266.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_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 17032 bytes
SHA-256: 11a63f8beae62830dc71679d01fa60bb375c7c694063333c6370f15b0de966d8
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 10396 bytes
SHA-256: 45f6c158ce7574479a77826e5a38b11e90b6f194fa9446ddf2c181889f7f05aa
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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