Malicious PDF — malware analysis report

Static analysis result for SHA-256 16359cd88ea0ac26…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 19:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fc12cefbbaa2f376b91a7686ad8fcef SHA-1: ee17317a75f1cc7e6c58576dbf05a27a15c7ac94 SHA-256: 16359cd88ea0ac26183aaa865777ee977069a083261928a889dcd0509aa17a1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://syteq-pro.com/userfiles/file/wivapa.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g9rtfpddnhk2vvs5qjqihhk0tn/87988578168.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/xepemega.pdfIn PDF document text
    • http://teifsepahan.com/files/file/gajof.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/8756221796.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/79641479359.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/kizaxufivuzizenikij.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ecece8684---69927891904.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/564178230.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/tipidabaxa.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/kaxubuwaresatex.pdfIn PDF document text
    • http://jfe.hk/userfiles/nefakobijakilafolozenufem.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gelegadokubowop.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/85468552668.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e49f426f6---61126792617.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210805150547_0wgutg.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/l1bmvma91drnab1rhd07m5ao86/17185448623.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/v1ik8e4uhlae1icn10jnbdasn5/55184974812.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b2ea86ed---dexexukirotekixokilajaf.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/laxiwuxemired.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/13247123315.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16070812590927---rusojukixuko.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/botalekugajolamajut.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/34246407309.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8bcf9d813bfba241c04a94369a3eccf4/20587099949.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a13902a1739---69841016036.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/purugulikufobelapaxexed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=use+of+message+box+in+vbPDF 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 17708 bytes
SHA-256: eab49df3e31c03956678df2dd7f844d9c21354333e8738c371cdbc8e069b888f
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10628 bytes
SHA-256: dd8851c5da198981413507272ace9d7de0cf3a30993a3b579455cb666ef8cb84
font_02_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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