Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1743fa6c8a283b…

MALICIOUS

PDF

169.4 KB Created: 2021-07-08 07:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f10365ad34fc55dd756994293353922d SHA-1: c3586a93d8e76d87008013303d4fec20f5ca8a2c SHA-256: ab1743fa6c8a283b09800824f2e33bbfeb1c5e7b3b0223b24a3fa17859e3517d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/88aldvcnhqq22j8n9e70kde4p3/wijedobakusuzanet.pdf In PDF document text
    • http://wami.cc/data/files/dijagejofadiwig.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7aeb01aad---4006252360.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120654275823.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/98014393929.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a723e6831e---vexapemamakomutakumutes.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c4782c962c157efa949464993ab0dfe1/jurixopalo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/heefgdb1qgan6gs2cla166bb83/96395280457.pdfIn PDF document text
    • http://chongros.com/userData/board/file/pefoluweleditonu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/50788208683.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b409d1ce979---5294666330.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/44956072312.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6415d4a90b889ead7a5e27b68f602ecd/22952815605.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/02f88bcf2d02d28fde18e069d2243535/38624251790.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c5dac2568e0681977f74b8d251f385e2/23700051630.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3083ad4adfff9e05e172b201caaf4eb5/zexixojadevi.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/db895ddea012e0b76435caa0f540b9da/nadoxi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfb2e6f18---34369123375.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c37961254---rudizaforepubawalugu.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/lekarikalojakiperim.pdfIn PDF document text
    • https://mattress-leader.com/media/81178639162.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/24890813761.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096f014746fd---jomofejisuxinusilogix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dnd+cleric+femalePDF 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_off0002398d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2398D 10252 bytes
SHA-256: ceefc27421e4abc5a1bb6b882984c6f76810eadc87e25c10dddbfd0791ac5e7b
font_01_sfnt_off0002507c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2507C 17556 bytes
SHA-256: 5f06e4cd91a0a462089cfbad92b19c1d4fc8473e3336c177136da03b77821c50
font_02_sfnt_off00027e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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