Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e1b27ebb69520a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 19:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81029bd213e5fdb49e827ca27c7a116b SHA-1: 75c95d9523355664de1d58c35b5c88acde3f0a73 SHA-256: b2e1b27ebb69520aabbc1d1aa0d7cd341485bbe4ef2a4eca476b60b5b52bdcdb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://hevolta.com/upload/file/84869849795.pdf In PDF document text
    • http://edituj.cz/res/file/wudajono.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161359b5737ab3---18095505526.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tisitabowedevaranusuboxad.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/87613621015.pdfIn PDF document text
    • https://isosklo.cz/uploads/mapudobos.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/lagelumipabomudef.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6e2d975406cda8dba041b8b7cdfc8400/29991533002.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4ejh9auemo6htaoe65a7fqlq9c/44988215986.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/58794089971.pdfIn PDF document text
    • https://partetesal.ir/data/file/supuxoguwewetepekalexajel.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/gerupodigonesofupudak.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/73990613012.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109031752049022.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908061322510931.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/53767915839.pdfIn PDF document text
    • http://myphamasia.net/upload/files/86669829175.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/45402119519.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/75066394157.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/96602717897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wkhtmltopdf+brew+mac+os+xPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA81 11104 bytes
SHA-256: ecbdcc189dd5d81e5c7d04867628f4476caea2d3c0a1c7f677f113983529f149
font_01_sfnt_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 18800 bytes
SHA-256: 78d773c05614aa9807334b53f6d60dd191e23f9cba57042a2107226868451f87
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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