Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d95edeb2bb1c6d…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbf41ea4744e10f1c1ce378aad1dabfc SHA-1: 4fb1c52ca4b2bbfda86ded6e806fdd7c86d50593 SHA-256: 38d95edeb2bb1c6d349e641abebc93b2e68898e343c0a6f718209e6d4ccad090
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it is designed to redirect users to malicious sites. The presence of multiple external URIs and link farms indicates a probable phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=monster+ultra+rosa+nutrition+facts
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/bojovekiwokeli.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e6c4f862a29a02d1e2f9a6b28319c76f/nevuv.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/911e50c2e80bc2386bd19d58d4ed1a14/95640258298.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/mewosowaluxof.pdf
    • http://aqbnb.com/uploadfile/file/55994906063.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609432e270280---58975407450.pdf
    • http://afgventuregroup.com/cfiles/file/52371210515.pdf
    • http://caigeshi.com/uploadfile/file/2021060323132973499.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af965ad4194---70066367539.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04ffb809d4---13506895030.pdf
    • https://stdtekstil.com/upload/ckfinder/files/82644030872.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/73de55a3f2552e5530ac0ea67fb7b339/vewebisitu.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2438a44bbb6b6d7fbce92abc07fb2c41/37975318947.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/56969047208.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/322120a21f9a5d54dd9c27d3c3a68990/lotugolaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc1461a1---95022360522.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/871690f047713380c6b0491715569c7c/68065054327.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625114802690753.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a183cca1dd9a8f04b6623c5145943fec/fopafonarepanovik.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pgbbhcgidirdo6r9hhpflp3596/xasixomom.pdf
    • http://timeyear-v.com/userfiles/file/73395740004.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7cf758b3964511e0e3c4ca7bca87cc84/pisupamamasurutarul.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076acea1c15e---tovanuta.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_off0000f7ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 16792 bytes
font_01_sfnt_off00011000.bin
b640838f59a6b05114cf1a0cd55c5a2381a138f9424782c40b27b498e0ae865b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 18168 bytes
font_02_sfnt_off00013ff3.bin
460907b06bd7f91c90757f7b741c6b9b53f9e24de2c4b96b397f31c972e34d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 10420 bytes