Malicious PDF — malware analysis report

Static analysis result for SHA-256 136a045bc2019b4d…

MALICIOUS

PDF

84.1 KB Created: 2021-06-30 00:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37cb458ce5c5a5a5354dee6caa1f957a SHA-1: cbc075cbf57e526d34f59aa40ec096794eb8bd95 SHA-256: 136a045bc2019b4d99e8726a192505b84ab5b557c96ec0ab3bb9247f465ba7cc
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL findings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://garglob.ru/uplcv?utm_term=gravity+on+mars+and+earth PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a1onep33mful28snpmftdfg2t3/redenufogonitojozewowu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/27653623472.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/39946571912.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4ouuq5vup7770l1m7jkkb53a3r/42522376226.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/s7e4aq42ihimjf59sdit98t3g0/87244536468.pdfIn PDF document text
    • http://cichanski.com/Upload/file/78622722859.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051321443935.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/61473008755.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/48899899162.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16cab5fab---63726844517.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1fe2b3d7---sazujiwifin.pdfIn PDF document text
    • http://hotstamping.pl/files/file/11298530919.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e772653e96efb68d57f5d4b548083599/vegigugiwupirota.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd1849a03---kutididij.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a415f9b0b4d---48183434549.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/61153461708.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/pekifepurijikizilawa.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dca3084c15082fea989fa64ae0e5ad20/teporel.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/77796924589.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160706bbba7582---fevar.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fd2da4db78e9079483141478e6ad7587/1750689729.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/vikimozavabalorikil.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_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 10688 bytes
SHA-256: a60de51260c8a9133ccde59f8f6c6a6f72db8ff3c118780d07f3cfe7620c3ee3
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 17192 bytes
SHA-256: f26adfd32b9e75845ff4b390c3ae1294367558ea55e195347d71d55d0f94390c
font_02_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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