Malicious PDF — malware analysis report

Static analysis result for SHA-256 1919b37467861570…

MALICIOUS

PDF

95.8 KB Created: 2021-05-09 22:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 488a93d90ab8ff76d4728dd4b70717ba SHA-1: e30c0d40b7c47ae178367ff1a01d19025f00eff0 SHA-256: 1919b37467861570884bffeb822615fa82607b8fe6f237163d9424899ff3e52d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'forecast templates excel', indicating a lure to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=forecast+templates+excel
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533d8a212e---7843987716.pdf
    • http://ahcxdq.com/uploads/file/071150423373.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609590fe1cf37---25744424823.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21aa4c8c7---13461299829.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095294c30d6a---58524685186.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e3d94e725d7b9ab4b84437954a14cbf4/58035943471.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f14660af---gazuviratijarosalomure.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160898a143e184---21086765293.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7578834064a67d41f6629e7d4ac09f27/zamigos.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5588e104c---rumudexedimara.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d203df88413039051b7fc8ae44ffc304/fezawijerasikovoko.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5df1ed0de58e365aabd2f554cef35397/ninixewi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfab095ca8---25453088043.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/3l47t3os4fga2b3sev40m1h3mo/11398842452.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2ffc966b0d58eb06fdd147b63ba6868d/66791861658.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i36gm8u8cu4kah16agsas3he04/86758017329.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080a748d311d---vatasinimazugitijutej.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7bbdf0c2---fukedewuvifiwatepif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a18.bin
36b158fcb177f2317db43838cd32e50037b89f95a37fd000bd8ae043dfe8c88d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 5104 bytes
font_01_sfnt_off00014b60.bin
1887e54d438725577c4e1368a0a60ab442a003a4460e9be2138166ab10c3e6bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B60 11452 bytes