Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dff6d9c4e4b6dae…

MALICIOUS

PDF

90.0 KB Created: 2021-07-23 18:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 450fc3a0fb96292aed64bb05afd4ee10 SHA-1: 13e213a7c803eba0478e518099718d12d7d6cc6a SHA-256: 0dff6d9c4e4b6daebdc3a23ffe3985d524608b0bd1432f47480ef83b8a1620b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://orlickachata.cz/files/files/soketerudexikowemezefe.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/taxupepolidanajotaga.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc837d88122---dewibelabalolu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/miturofobewezaluvovo.pdfIn PDF document text
    • http://paliukenas.lt/i/File/95951019655.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/922dc51f2b62d76f8c9d87d8a8eb4b13/26937584188.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/junugibezugozomukin.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/80670175739.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wakolezixojigavikevokugi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8a4a8320---257863446.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8222789782d6366d8267ac048b52d80b/43679897706.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703b3a9c0b2---rexubinuxebovuga.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083abf94823c---xetawuzibitesom.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/87555hnlf8bo9fi7cl6obg40lt/85045561155.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/pebivozelumagi.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/48445858584.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160852dd8e0940---likil.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7a1ab344b48e10aef78eb89646efad3d/kawiwowamobufimiju.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b30be6dbb3---15249300513.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9aabda73a---37796527931.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/090e6357544b777d5ac4ae75854fa75f/88649660959.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/94728234946.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/pitewijezevomubinoduvize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=problemas+repartos+proporcionales+2o+esoPDF 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_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 18872 bytes
SHA-256: 7cc7e216c09cd209d9b7f814200c31c5c07756ff90f0431ad1999f657faf1a6f
font_01_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 10796 bytes
SHA-256: 4e90d70192fe46c81980c6232ddd92e9ce308ac6472f91a634297e0969f11916

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