Malicious PDF — malware analysis report

Static analysis result for SHA-256 725049eaae1a25e6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 13:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23eba6cf530269d38c008c35e99f7860 SHA-1: a5b84cd33fb58b52660052c6e951fcf30e456954 SHA-256: 725049eaae1a25e6028e80b7cbfc0b098b0432f4b3b4b08f206a777efe65be78
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to domains that are either compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cosmik-kinoteatr.ru/sadm_files/lajunudazav.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/tatawagujo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0762ce72---34575986863.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ilv2jdccv74ehe17tbgtivcbti/41713507373.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/repexivabuvabufuzemexet.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/suwigibalowaz.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/9na2ah79uret0q108fj64cer3b/bikadakumifus.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b6fd0d8e---bupokuzetorumarakikiti.pdfIn PDF document text
    • http://yulintimber.cn/d/files/29485494552.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5d6fe8a7456e30064307fcf2c522cbab/6999710711.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/61697431241.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0lf4kn0qnsvsdeih2vhabcbgmc/66500586233.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be31e7112---57127285134.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96961346918.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/42009703106.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d4c890a5dc306be3392814a3b24b41b6/85310985710.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/140a6628e16f95300cfd6f744623f3e2/voputinox.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/betemubemasibitexaxaze.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/babilonerilowupisopipewo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7e6a0577---mezefiraguxibumoko.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/bazopifimeperelibamazex.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/s4ufbrjj5q1t9op0sf8m9au4e5/45396456707.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/61703346020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7918b328e6---dubipoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=coartacion+de+la+aorta+tratamiento+pdfPDF 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_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 10644 bytes
SHA-256: 23466105d816091d5f706af2c20597b195c24fcad5bab408112e71a5a2789f86
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 19252 bytes
SHA-256: 97899a9b25033e016683c733782fc5cd52b34f47e5ccb899695ed9dd2bfbfc7b
font_02_sfnt_off00012bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1