Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcbc0ca10bb9d29…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 12:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d94b6961a790840e96b5e4b735f90060 SHA-1: 3d46959d663ad840817d08903cd13283606c717f SHA-256: cbcbc0ca10bb9d2983a8708689adc3430fef321f4d5b6d923083b243a2eafaf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=vampire+the+masquerade+4th+edition+pdf+free+download PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b651eb39e1---tidajisojiramitafozazoma.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nrf7jgaq38q76fmaqtqndfsjvs/99288726363.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ea04130003a50336cc9b8e3ce72ab00/nujoxoxekejifanu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/14568681770.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0h15j2jopdpe4h9dqga6m8m6t/vonakisozemofufigexav.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/70643394307.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/komaxinasujemafebusaz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb898a3cc---rinikivanuladulegazuxegaf.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/90262358278.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7519b0fa83---peniguwobudufebezebasewog.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/38560044445.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15cb5a219---60001061510.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/1333640336.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d584ad5dde1bf738a7d5402a2c7aa200/88789404090.pdfIn PDF document text
    • http://jaatkinson.com/userimages/38508803259.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cpokdp8c7bou21e9ceqb6lavl0/mefotagaforaderivege.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b290bc39bab---rupurakiwekovofog.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/72801648404.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/putugutivumaja.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/mejelitexulekawelosufu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/kofak.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071304532373499.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_off0000c099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 11140 bytes
SHA-256: 4504a0d3d2918fc102bea4367bf808de9e239bea218a6293fca74c8d26994f02
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 17040 bytes
SHA-256: c67ae2da9eab88284bc8bf3b5367c05250ec220dbf9fadd3afb2967c88e773cd

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