Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbba085195608559…

MALICIOUS

PDF

139.9 KB Created: 2021-09-07 22:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2df027b77007b3add27abdb65e365da5 SHA-1: 2d5b375dedf9b25f4f0fbc8f3e16c85950dba720 SHA-256: cbba085195608559aca8af63452d517629d41bd899f7ae34f1e83be8c43c74c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on a compromised WordPress site, with numerous links pointing to potentially malicious or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external resources, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c51a9898b7---49711624565.pdf In PDF document text
    • http://myhomeinparis.com/userfiles/files/94514887445.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/30597363960.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2677621c34---wedarebam.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/342cf862c4909baace7942b7bdafb517/74343596020.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gakivisivujog.pdfIn PDF document text
    • https://digireg.cn/upload/48060665694.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1610a71b1229e3---73534202127.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eed0595580f42200a9169e60a59f71ec/rirapuduz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7607fc84---jopimepikadoxeviri.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/039a22d39f4971f26a35ff993b63e51a/5882060186.pdfIn PDF document text
    • https://techlan.pl/files/file/65609322181.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611740079f066---jojesefejavuzisuwiz.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/dukabatepotoguzozuve.pdfIn PDF document text
    • http://master-br.ru/img/file/ninokexobuzunenarapim.pdfIn PDF document text
    • https://bem-sa.com/img/file/sewebemekajuvemijigoj.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/3308020963.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2e01a404ddb95aa9f1e7da756c8ebaed/19002129651.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/91121683142.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/movubebiwojogaxumamelasi.pdfIn PDF document text
    • https://htchninc.com/d/files/61652086745.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5l0e7lksiou9be9aknrriag3c6/22750679233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=decalogul+dupa+hess+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B452 24440 bytes
SHA-256: 10998eb1a2c33b641733c239c49136482b6c649eeadcb4528ce2c524bb570dcc
font_01_sfnt_off0001f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F160 10604 bytes
SHA-256: a3083ff1f493811a444c9684372444583d8efdb338da0f44e577286462b8e5b3
font_02_sfnt_off00020993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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