Malicious PDF — malware analysis report

Static analysis result for SHA-256 85121a8050d5f535…

MALICIOUS

PDF

100.0 KB Created: 2021-06-29 06:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 089c40e34aaaf3061f045b3618025089 SHA-1: 3c8e9f567adab20bb47ea311c7e421f20cb37c60 SHA-256: 85121a8050d5f5357d68dec169807b5dd3313dd620f1ca648015878b7442638d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=another+word+for+personal+driver PDF link annotation
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/22686862304.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607188665d6d3---42562669246.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/67074037235.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/da32bf831185b75eb92b5887ae06da19/sujawosopuwiwinituxaman.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6bakubj8nkucek5tipvu063ud4/97204122403.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f091de54e---62799922959.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/319a3adc2031896755fa3f5e7a57391e/duvog.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a233ddaa---97112562183.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8qjluc2mh9g6bp1e6te2oe5tsq/16614256386.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/cc2850ee98db04402ed5454759fa2d96/turewu.pdfIn PDF document text
    • http://turnyras.lt/Files/file/69962340354.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/fb55ed14d1810e62561301a23d14f84a/5506245220.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/38664935877.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bojidokir.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/74523133308.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1378499a69---numosujexopibopefesi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d4641afa---kavevumulajafikimuborez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609210ff601ac---63914470888.pdfIn PDF document text
    • http://gdaniec.com/upload/files/99642482758.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zafetisopoba.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12305434997.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ddi7f0er4lgvudnf1c4barkd2f/83452749638.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 17524 bytes
SHA-256: ddaf222e49adbfe7d5c66abfe2422ea5f49f87b6af691158b7b9e1bd6020e150
font_01_sfnt_off00015060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15060 10728 bytes
SHA-256: f96511f83aa4267389069310967204f8f358c0e589b6ce4879410eb08e7d95a9
font_02_sfnt_off0001690b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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