Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ad4859dd3d8fe0…

MALICIOUS

PDF

93.2 KB Created: 2021-06-29 01:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a18e935f544d042d71ad2b57ccd9e78d SHA-1: a929bfe6e2851d70003f43449a592c803599be7c SHA-256: b1ad4859dd3d8fe07c723fa26877c9313e03fac94faf63364555c81e9d1c6e29
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/nk7docm412nagfc83821gm8ph5/sejujulupegifoxozebemekim.pdf
    • https://giga-tronics.com/userfiles/files/94215378418.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/resotagopiduzolufumudamed.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/48307f58a2f1ab8bc14fafe77587fc6b/18256580340.pdf
    • https://motacademy.itfile/vapijod.pdf
    • https://studiovizia.com/webroot/img/content/files/bituruwirazeze.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099b872a8052---kuvawafumi.pdf
    • https://sunrise-photon.com/upfiles/editor/files/18778312921.pdf
    • https://airflow-skateboards.com/upload/file/xojajitedelamizo.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r51a9vv3t6l8jv3fu3dfiaedjd/7252814304.pdf
    • https://manuscripthandler.com/userfiles/file/71957768876.pdf
    • https://advantagelic.com/singhania/downloads/file/92944422700.pdf
    • https://giverny-bkk.com/upload/files/jiwekebu.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fci4fovcn1i2l37qb8st0m2660/lavexiwevogapoxe.pdf
    • http://greatnice.club/updatefiles/file/5516344345.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd311c04c---14411646951.pdf
    • http://lookkorea.net/userfiles/file/wawipena.pdf
    • http://goref.ru/files/file/ziwiwe.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb56cce324---22828690659.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1807a8a1---95242746496.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mukki09hpugn3a9dsnoil6juum/bovawidi.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jm4rjk514lamem9t0b58mnfcnk/39781016549.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23f4da4c6---kalazatezaf.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609215ea4ee38---21568779619.pdf
    • http://myarrahnu.com/mo_images/files/44711703622.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fe75945f8---tirelowixizobakeganudum.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/95030965780.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=use+mocking+in+a+sentence
    • 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_off00010ae5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
font_01_sfnt_off000122f7.bin
fa9bb34b7a1b2597ff99d80e0660a04b4a2d89f0b02b82f64aa4e4a6ddbb47db
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 17004 bytes
font_02_sfnt_off00014f4c.bin
fb68457ad3d2a65fb14df4a6a1b6b02f1cfd1cd0075e1e4aacfb186a90c0db58
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4C 10528 bytes