Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fafd6e77475eb58…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 09:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77feebca89dc546f4ebf3f5ee798fb3a SHA-1: 376d126f445f2ce44961ae76187f057f25f7094a SHA-256: 9fafd6e77475eb58b4bb07e31c561cd6b4e65ce47a0096484b7aad1c3b9917b4
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The file's structure and the presence of multiple external links suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=police+sergeant+oral+board+scenario+questions+and+answers
    • https://istanajp2.com/contents//files/55923331402.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6uob73kcbcf828ihacskl7ohta/dijodofiroxufozaj.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa60ee454a---diwogekumakerexu.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g00hpbsk8kh6er4lk9e3qva4f3/febavesosorevonaremejus.pdf
    • http://bet-balance.com/userfiles/file/givuz.pdf
    • http://soupworld.de/upload/file/getirulividisanusojub.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af5cc9c02---64984874596.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcd54dea9---60870967370.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/kic19lpbhqjdhlls415at56008/bagolovidimil.pdf
    • https://nhachoxebus.com/upload/fck/file/37104658734.pdf
    • https://bigpointpin.com/calisma2/files/uploads/sudikadovofimimifub.pdf
    • http://stlnsk.ru/uploads/file/54269981365.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc61aa98f---89785201005.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zojesijoduf.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df5556b033---92688596207.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d4a178c7b77b196fa24eebe8bda77781/volazetaj.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/47990064553.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/221tc36opq6ba0r45cq9qgenho/befujivivepelubis.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d0abb417---lefunawigo.pdf
    • http://studiosimonepantaleo.it/userfiles/files/vagebojoxiwigutisilujar.pdf
    • http://lnshiyue.com/userfiles/file/20210525041840_688483782.pdf
    • http://fedime.org/imagenes/rosuroxedorilemutaniv.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a9fe2901---99491867988.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f492.bin
2486a60a8863a39c30f736c0e9511af8763373520c5dbe4ee9d719f9fae90592
pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 11016 bytes
font_01_sfnt_off00010de1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 16792 bytes
font_02_sfnt_off000125f3.bin
0b6a975a166a0bc2843ce771af0f8487359d5dc54b9b5c3bad8a28a56f03dd06
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 17044 bytes