Malicious PDF — malware analysis report

Static analysis result for SHA-256 df115f6769da5181…

MALICIOUS

PDF

88.2 KB Created: 2021-07-23 00:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3771017566f2d44660f1c13252956a16 SHA-1: 6e43a15869d9886857907287335eecce66083a07 SHA-256: df115f6769da518168e7f16f4b14f7c000bb2fbc021d92fdc2313b77e6ee31a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism to malicious destinations. The presence of these links indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1284c404e---dusogizigavenorexakejeb.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5856d4a5---19575409594.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c383c822b9d79115e52ed8520945e666/55224950916.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/48325243546.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b90e53691bbef78fe78091504e1591ad/jaxujapuwulupas.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c7dba82183c94fd4fdc5142c3970aba0/95999155858.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/7tl9u1tbp472c06ieiqbj7msv9/98970968748.pdfIn PDF document text
    • https://sinarwaja.com/account/files/rilimebiru.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56774861e---tavugawikekorefosa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dfa37319a90dfcb64525c2249e7c31a1/dawosujawesinu.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/zibawelimibip.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01485f3ad---nenefagewozetewagavojole.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c983f0723bb41540dd4e756345290a6b/pewuridumepi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079faa983ba2---4072580789.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/74485478462.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c6048de9---34232325079.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xuwagasudoxodosuv.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec42c159e4---56329580712.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/39957373039.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/uui3ierfn7nhgg4hpd8vlse6gq/52912672369.pdfIn PDF document text
    • https://adikketiga.com/contents//files/pisapolesuzixutasev.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/vivurusosoveredukem.pdfIn PDF document text
    • https://ubranni.com/uploader/files/poduw.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/jabew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+fit+pdf+to+a4PDF 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_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 10096 bytes
SHA-256: 63e9fa0513a5eb19e2193f831a47c099a2797182c83fd01cad513b919179ab38
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16884 bytes
SHA-256: 5bd37e0bba725bbe67ab7beb0d3cf04e4f8be2131f3ebebfbaf7c54f17d7ab57
font_02_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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