Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c88448699438d6…

MALICIOUS

PDF

131.0 KB Created: 2021-07-09 14:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 12d8c22518176b44e2c147f29dfa9242 SHA-1: 35b72fa785dc17c12f4784dbaacf1cf1ec8e01d9 SHA-256: 93c88448699438d66370add69b73ccd6f6308b257b09d16cfd22fe852bb622c9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs are the primary indicators of compromise, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e771393f8d3---lemoguzisoja.pdf In PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/92732125243.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/k4p0eilh44g30a56nnjvoqco07/wopot.pdfIn PDF document text
    • https://olterus.org/contents//files/47637879240.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b0b365455042a90869c72bb077647a1b/37303420009.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba78b98e8---punanigid.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/vifufifuw.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb31944460---32464859957.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/884835ae2c08c6d597be975cb2337346/69168852453.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wufab.pdfIn PDF document text
    • https://mfdesign.hu/files/file/42567465029.pdfIn PDF document text
    • http://grupophi.es/uploads/files/93390090059.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedb95859f---56475374696.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f943359f6---19558159548.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f331d8d760---zumojokepusu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0342d1d7---mepadopakubuwifagaza.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/14489afea3b4f504294472984dfbd483/zozofivaxedobi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ae04664db3ca185cfc7385385fbf7a5b/68044286773.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xetuwebetepijaxefel.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/jiburewiwo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7b4e2bbbd2f2a589b8b146ea3e74302a/46752308565.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/sudiferineb.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/65fd99922170e3fd8ce353ca803e3eb6/76713448436.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/41077428340.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1cf89ded---46345918304.pdfIn PDF document text
    • https://brs.jo/userfiles/files/gifetigukobiwifiguwavej.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/dotalinuzitureranadilop.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/908c1d0312c5410bf71f214b0985689d/vipunofil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=arena+of+trials+guide+afkPDF 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_off00019843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B05A 10700 bytes
SHA-256: dc3f9c6f999b8f6cd7130a5d33a9214193acaf0299457a7e12234d80c9486e93
font_02_sfnt_off0001c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D4 20460 bytes
SHA-256: df125fb739ce7f3d87fa33d69765902b3c97b1969aac72a8aaf6abca3977c03d