Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8dcbfe91e6a6f5…

MALICIOUS

PDF

100.2 KB Created: 2021-08-17 02:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2b9935eba6020799684f71a206cc634 SHA-1: dffa30b2258ce09cb7659f38f0ed1c2327a13762 SHA-256: ef8dcbfe91e6a6f5930d25cccc980c24faca02fdd94cf569cf3f5f23da3da466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://er-trans.com/img/produkty/files/47730960037.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hggdc9mr2h97if5t5gpabeg99r/borusukoligalukiw.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/15879162683.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2273bf8ad---88603874436.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d663ee47052---bejulivilezodupumenolejej.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7169126f76---7356214683.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/28560900476.pdfIn PDF document text
    • http://0930actress.com/files/files/42836134339.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vofalusuboritez.pdfIn PDF document text
    • http://ecole.ru/text/images/file/90752815175.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160738f7723833---54739554282.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///50949742781.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kibilafafikemibedakabejen.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088509ab28c4---lisowopovod.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fc688838---vodepezu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fb4eb56072ec3d63e23fe168b897d68/sanolekivogikulalukaxu.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/xobexizuduvixomagaki.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e5996ddf---69251554745.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16110e43011248---64985425439.pdfIn PDF document text
    • http://vce34.ru/attachments/file/89005219370.pdfIn PDF document text
    • https://zzwgjx.com/d/files/seponawukivo.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/56756068389.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/56501028078.pdfIn PDF document text
    • https://hoalavender.net/upload/files/70818813923.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0fff1e620ed74eebdb854b8966f372a/xexijakibuxagekotesozut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=user+journey+map+powerpoint+template+freePDF 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_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 17644 bytes
SHA-256: c4730c5c4b6bc92fdd22a6e244dba57d19c792c8c7c4108d06cbf91f131d8c96
font_01_sfnt_off00014fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE2 10956 bytes
SHA-256: a041dcd58bde1e9b902cb10228d7cd29f3c373d1e55d55200a6514b48edc8490
font_02_sfnt_off00016955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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