Malicious PDF — malware analysis report

Static analysis result for SHA-256 244f26fe6aa31b22…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 12:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: abe9a60db383ff8a074681890c928159 SHA-1: f6985a0475d95dfbe47e99c82f22a3367971ef87 SHA-256: 244f26fe6aa31b22043821129d85959f2ca1a726ca6eb9937ee54fcc7e94ebdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=compare+and+contrast+two+texts+worksheets PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/alb3iidefmad45ufv25clg671c/12040924769.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/64553528635.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/te0ptous27pdidvn95gg810r0f/weputimuxutoxemubezer.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/sinozopimug.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/df27ac5df3d0a69b14633a399b7e8fea/86929110454.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdeb71ee5---19262910860.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/83193269031.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/62921894929.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/beganemidujoba.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/sedozotituxa.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/36a782913f649b44e0030abcbdd6ab6d/3692160079.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/tawezagimafigevologuv.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/30241666469.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee31b3e916---71740625045.pdfIn PDF document text
    • http://kleiberit.ru/files/file/88298067709.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/tafoxukotigaxobekolela.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c574ea448b7d446e6191b3baae6716b4/moriboxegimalugunefinax.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a0136c3c01949b89b3f6e85e29271e8/94772603319.pdfIn PDF document text
    • http://nenorm.com/files/files/12304742266.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/51360808741.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jomiligox.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/50315263299.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0386beefe3d3e15793b86c68c313ac6b/97638877242.pdfIn PDF document text
    • 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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 17840 bytes
SHA-256: 7953e9f27ca54a2b60600c22f90bd864fe5f45822805be9d6a8091bad01901c7
font_02_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 10952 bytes
SHA-256: cdbb8ab30ef43e28eb9d436dc09fe9a5fb33d4f92ecd9a1bca8f44a38b7a0371

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