Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f2b85d9dd4df9a…

MALICIOUS

PDF

78.2 KB Created: 2021-08-22 02:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1f468bac685ae8dfc22d54059f90634 SHA-1: 61adca5a028f2c9f38c52debacce6409739dda5d SHA-256: 79f2b85d9dd4df9a8c5aa8961f67df04f74b6192a0ce86db117f5e0e92d933b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lagostena.it/userfiles/files/gigixilogapojofulif.pdf In PDF document text
    • http://allycatering.com/userfiles/39403741296.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/tuxukafujejun.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e0bc4152b---zupogira.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cb814d62a68dd08917c76d73be7e1f4b/budemoka.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/81219821150.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/kavalowuxezegimu.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/lubid.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887e52d063a---kenevibaboxetexumabipig.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/sinusewavuzarelujizon.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf993bb91---18495549476.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885214dc480---70578612871.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/70ed56b544952b2fdf20349d105fc2d2/mifonafatofug.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/joxasivejotigojuwen.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16083739d45cce---96300414399.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/xotorurivibutuj.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/38270958606.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uv9acg5l7rs61mo9eob5k56aq0/taxavagoxizirazarobamofuz.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/79212989544.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/33591694563.pdfIn PDF document text
    • http://aurora-c.jp/files/files/forewiduzedawelivoborudu.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/75346320505.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c1c5a84db87f85f4b9cdb4981fcc89aa/vakelo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/pudovimevasafuvafuwifeni.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/9522433965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cambridge+igcse+physics+laboratory+practical+book+answersPDF 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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 11424 bytes
SHA-256: d85cb3a776f67e1bc8434d9e2367bfb74805e620f390ad28baaaf83eef4d3499
font_01_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 15728 bytes
SHA-256: c4f97576f025396d3822a54de026093137b513c0ff87cdbcdebccb42a226a9ab
font_02_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1