Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af7c5e179e8d6db…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 03:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14f2ba0e06f14311b7469f3b61a13142 SHA-1: bc5fb6cbbb5b4d402de1abdee697e4fd47865b00 SHA-256: 2af7c5e179e8d6db03b48bc97766f8ceadf562c04c910a5448528f6a2685d288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable domains, indicating a link farm designed to manipulate search results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://akcjonariusz.com/UserFiles/file/xofoxuxufemedov.pdf In PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/zexomukivemarita.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94795133282.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d813416391c---nekokekumemor.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611284a4ddca7---kimubegoji.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d4f3e9d5c---jezuregaja.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/1tdcm0j5v40lr1fg9ta98kndp6/dolemosiwapiwezikubi.pdfIn PDF document text
    • https://hse.tw/upload/file/94615412944.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/73243033629.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/fixuvemolivexedigim.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/28c1cdf48dbd023e5555b5e08526a07b/10104423269.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kavawobif.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5fa1718a---46963201673.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/87604004703.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf99ad49b8---59285962477.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/kumeloxawi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a4fd69836---4861905512.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/34027011413.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ks4ttgh6n2ovnk3nglnncr8kq1/23440364375.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/48843654735.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108da82a4b5f---kowimadurafunewopoxuted.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/fijilabasizavabiseg.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084db04433ea---kokiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=4+high+rolling+millPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/74f506daee83ccf64377461df8061cb8/kaxalaxamevejerewifas.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_off0000c236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 9976 bytes
SHA-256: 9751552b11ee57e0f8baf04fbad453cce265ee474a42e1bd4a213cd970a19f0b
font_02_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 17564 bytes
SHA-256: 6cf594e1e0461ac89df4a2fc77c4b3b744f481871bdccdd7eea8bcdb2f9cfed1

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