Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a42ffd81d3fe543…

MALICIOUS

PDF

109.8 KB Created: 2021-08-22 02:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4ceef7678fd7a0f229ca368bd891ba40 SHA-1: 2d64f45bdcbb5b30ae89989f12faf10ad7b9ec20 SHA-256: 2a42ffd81d3fe543c98fcf215986082993adf8f01a44f1f81f8d40a6b55a6901
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://ipsgroupjjn.org/userfiles/file/wadowovamoforuxegogeriba.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b7780afc---xemegiradepabepewaxuzu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/zurume.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb686c0e9---60921082758.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3ef28a3d0fe29bc6f08087ef674186f7/jiwuguturatiron.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f6bedf54---xajizesojuroroxaf.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/42879103588.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/53aa70f9cc879ec63060004ea621e705/rexadixesexobugapuwipe.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cdf126083aaf4915051f5017ba6ee24e/nelizonojepig.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48dd7a3ad---pukivaginoxurib.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/89197766805.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/lolaw.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609112bd210d8---83959904320.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/6625176840.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/30459200874.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/31cd46e4824f8cd2a1fefb128bc797aa/76424249465.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/xivumokumopasetaxok.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/89212155929.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/regafixanirixulitogewidi.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1628721680.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/pofuxomiw.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2269fec10e9c2fe450a38d43833f89c4/62276786407.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1123ffec---35983955760.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/37791509714.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/fazakejefuvirosulomes.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b80eb7b0530---80862501582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=k%C3%BCrtler+pkk+ve+abdullah+%C3%B6calan+pdf+indirPDF 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_off000144a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB6 19624 bytes
SHA-256: 13cc49c99ea89483d5a4cdd48e5463f08b9f5e742adfbb571d6d2a3cd2331e77
font_02_sfnt_off00018ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA3 11224 bytes
SHA-256: a34f5ad779cdf9d391717055e72e17f45b28c496a37f50bdad469fd8c278a391

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