Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c5b44de05cf5b8…

MALICIOUS

PDF

84.4 KB Created: 2021-07-20 16:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0b06f95292a4a128b5f9e943f247ffb6 SHA-1: acf74444239750f7e84d967cf606be7f63d7ad91 SHA-256: 12c5b44de05cf5b83453bfaf59d8679347ef453bf34176c383953ccaecf08059
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and Trojan activity. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://arrayamed.com/userfiles/file/56269741118.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad193a7c080---4888039263.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/wobepitawo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4d711269---59765610622.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06fb19575---14876930381.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607613ef6fcac---gazidibojagixadarinuvob.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/92990982953.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/06fb44839a7ed4e4a6fe7dd3b3e98a15/19770832491.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6d0000d0ad7623912c6e936c1bd3506f/dalipaxefe.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/34887591161.pdfIn PDF document text
    • https://faprosid.com/file/bakolevivezanesavapogoza.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda5761920b---lakumajomepewuvov.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3010161f41a10e51c31bb8c7bf524e57/bizewezibaluj.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/40717529774.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af98ea01a36---pedebizomugipasetukoru.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rh6dh8v0svmnnkposbljlg9ht2/11420323100.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/widomugeli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7c755d9---wowosajemib.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/nirotumezogada.pdfIn PDF document text
    • http://pronobile.de/catalog/file/vuxilewewofofojifozivaf.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/20200deb38118443f1fb6dd2dba359fa/munumajuvulibinepalidafen.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6e011d01---90465021350.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kuaeobb0a0ordtpf2f5271tme0/bowasujemuwofor.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/h6vr20cb7l33g9gqdmt81nf4a8/21039699081.pdfIn PDF document text
    • http://envigest.cz/upload/file/ferudewaniwux.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/117d2cf11cc74782fd02e08a42959a39/safusajeninoxotuneru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=propene+to+alcoholPDF 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_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 16448 bytes
SHA-256: b6e6614a08ac964ddfd89e7ae3628fe439608a384a9c17127c68a1726d15c44e
font_01_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 10212 bytes
SHA-256: 73ea3c778beb85a7c064ebdbc84cc5acb23034f49150fe501b5516fafb6d23bf