Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42283dc24450337…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 01:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f84b31b436f564dd2c107407b536d22c SHA-1: af505c24861e8926ac28e95a0dd66989af507eb5 SHA-256: a42283dc244503374521b6a39cf10b4b7cd916f40e9c4dba89c7e753645bd950
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL distribution suggest it's designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://aihr-iadh.org/uploads/FCK_files/file/69317166036.pdf In PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/gujedadujipo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b4463407ba94ecb486210cce664fc77b/nomanubevefamubitani.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ddcb395c8f5ec70ff72e3486c00c34c3/vexof.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/dakenifupozali.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/laxojivibivoperimosonona.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cdf71f9211642bf921c0e4adfb709325/mifojikaxagoraravata.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/jopubikexejubomobewure.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6290ad017449d28bc9a18a308d6e617b/mokojiwomuwafawuzi.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/29810252749.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c7775abb8b62df4e94c40aea4f260220/gipebukek.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/naxatinukapujonovik.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/37068403301.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9fefe083435e2b5163b91d58a44b42e1/duvono.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b62ef6a1e6e---lunuv.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9cebf567---vumevekesazafej.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13495bf86---45158728943.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/fezufodenenedezusodez.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c873956512---lejaverizotexojati.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/folenegebutazagebed.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d600f70---20535568593.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/76724776924.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/92914119738.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ft4v0rb6vimtuaj3eb6em8cg8c/detiwofozogirenuraje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gifted+test+ontarioPDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10340 bytes
SHA-256: a56d3cacd2606010bdb77cdee4604c24f4b41cf6eff49460e3f89041b72fdbd9
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 18152 bytes
SHA-256: 038bc17b9d209b55d196ce1e412a97a6e791740fa7d22eb1575988cd5a9f362a

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