Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09168a9178bdfde…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 12:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06387ff59566223c40c052fe37a6154a SHA-1: b1b3b1c7da61d7d43acb19217eeee71b65df0379 SHA-256: c09168a9178bdfdead8e41956e93006d0596968b6e4eb5bed3ff4c5e3ee977ac
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.udelimpa.es/ckfinder/userfiles/files/39205202608.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/filowutigebozujunobix.pdf
    • http://professional-tuner.at/uploaded/file/48397197013.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7df8e0917---laxeberivoxixokisa.pdf
    • http://bagiez.de/userfiles/file/zoxukuzi.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909232038808074.pdf
    • http://robalton.es/Albums/images/file///gelikerugoza.pdf
    • http://sooclose.eu/upload/File/11314353507.pdf
    • https://mahae.hu/files/files/momakobevarujug.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/tikikipesadewanogiziminov.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325475b1f8e---gewuverakevetinuk.pdf
    • http://dedanskecasinoer.dk/userfiles/file/42129914634.pdf
    • http://fecirturizm.com/resimler/files/ladiwusuzukisebagijetik.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/nisakugulonijegavomude.pdf
    • https://gifarlcm.com/upfiles/editor/files/kiluwutexemerifevo.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea2e1a45de---felomigulavajuv.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/konapegobom.pdf
    • http://cpk.by/ckfinder/userfiles/files/garosidawuzefu.pdf
    • http://belgium-ex.com/images/blog/file/zivigofupojemezajitedovid.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/80478593610.pdf
    • http://fosterfreezesantarosa.com/uploads/files/44244085554.pdf
    • http://c2ctrading.org/cms_upload/files/wekumobosipubipe.pdf
    • https://cuichi177.com/uploads/files/202109050621475720.pdf
    • https://aimtronu.org/userfiles/file/jadaxe.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=planets+in+order+of+distance+from+the+sun
    • 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_off0000e01b.bin
d54004f2dd7a82ffaa3dd77b27783ec03da2e2a7e2c072fa3173ce1cad05ce2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 18420 bytes
font_01_sfnt_off00011009.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16792 bytes
font_02_sfnt_off00012820.bin
e221f59bf00070a8cb88750a21c2198cbf0f8929e928c0c902dec69886012cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 10844 bytes