Malicious PDF — malware analysis report

Static analysis result for SHA-256 22423d63cc338d44…

MALICIOUS

PDF

88.5 KB Created: 2021-08-11 10:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1a0b312e02678b2d644917524d39538 SHA-1: 81ad9420cff2ad229808407085d8e6f280c8cc3d SHA-256: 22423d63cc338d44b6dd9090ca157735600a2154e8b9e434a123fae6a38001c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan threat by ClamAV. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crysiq.ru/uplcv?utm_term=ingersoll+rand+air+compressor+2340n5-v PDF link annotation
    • https://iqmuseum.mn/uploads/files/48685923237.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1082eaf5---diwopibelaxisusuj.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1571473742608de09e4e227.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jakabisotikuzawotorebo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3c77d49cbff5e37ac8747c0b99f68ca9/46459798998.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba5a6f7a3---labotupobixokaxedide.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608481762a266---vujadejepedami.pdfIn PDF document text
    • http://ellev.fr/upload/files/18298878957.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0b458299---99231558841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091884eb5842---patidip.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/9993806371.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s1vl0k71idd51hjklnk5hqghpu/6090515194.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/bapozezipamazalojol.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b388e40f88d7ee0dba8e3d74cadb047f/sodiwodoxo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lugarorafemojiwarodup.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/xisikibebakenavokan.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60745325816.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/nezitobumetomob.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/21202016036.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 11436 bytes
SHA-256: 26f9f9cc430a8ba8a6ab544601ee44e65870e46eed45321941c6af09054b5e42
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16952 bytes
SHA-256: 77d63653a28a0fe9dd5191a481cb29a45c92470735e2407c1953a1a8e9ffc72e