Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07889f4fed8faba…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 04:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5aa72e112043e688b3d64c500f8625d SHA-1: 0eebdee2a15fa52840016e4d7701bdbeed5e6df6 SHA-256: a07889f4fed8faba9091d03b16ee43fd3ab3a606fd6cda96a5599f8ba524253c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/867604cd23cec1f3191a3537bb88404d/79961574609.pdf In PDF document text
    • https://bbox.ru/images/shared/file/49347433036.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9bd5c711f7b294133480dbed6587625e/banugexidoge.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/zadowerufiduz.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/zavebi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2a75caf8f---42679734027.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2108061918357747389g9nxl.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0d97a8e57---buradawidefa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03b161f781---59428219569.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wekidizafa.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/m07fvf21scc0l4vl19vj1ivnl0/89155306261.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vrhcepuh53j9v2bghhujm29oc2/98806342132.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xuvitalorikonuzuvepip.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/06dbb2149d22190d82005782412d7409/wodegurede.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/85727228962.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/bovazifojidugubibetozon.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca7bcf8eb---tigevowivapobabaxix.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/s5cspcvjugeoi1a6o3g9oekbh3/62663958907.pdfIn PDF document text
    • https://termofriz.rs//files/jexaposonedikoruruwepud.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5fht0ov0mvqsj2rfttjk438o6v/gudazegokijekodum.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/4915443879.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/95052649626.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/nufokujidaxaw.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/3407706370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=statistics+for+data+science+tutorial+pdfPDF 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_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 17128 bytes
SHA-256: ee56fcce478d56856caac22c2da40bdda21031d9db0ab2f3e1f36de1ce6dac91
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10788 bytes
SHA-256: cee842b9f2c81f67460c6e0b559f7fb61418ad5c4359f2dd95b6a5cf60be50dd

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