Malicious PDF — malware analysis report

Static analysis result for SHA-256 87380d92f5062e4f…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 03:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a31f38e180bc89b8c67450a044c91697 SHA-1: 86ccb2b1edbe1905cccf3b581e119bc578eee810 SHA-256: 87380d92f5062e4fbaa072a0326a3018a6e1cf7896f0580dc5e56d584520c2bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of multiple distinct hosts and UTM parameters in URLs points towards an effort to generate traffic and potentially phish users or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=kentucky+driver%27s+license+manual+2020 PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qgctdjp77rumchh657t17ve7fj/togonix.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160932afac8ae4---33703306824.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/rumakuwe.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4c5a4cf0---38641199037.pdfIn PDF document text
    • https://doganagolosa.it/file/40547206710.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d36f544136---towejikuturosur.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4744374fc---serokobenizevobu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/54e70a13af29bbc985a0096eb090bb1e/jobalidodojaluv.pdfIn PDF document text
    • https://agatanorek.com/files/file/semuxosifosabe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jfvja853cvf197rflkovvrf4gv/wasavelesesuravelire.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbf801bba---54330426350.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf96c0206---4828587480.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dedonumod.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4691b987---1528236027.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/42556520805.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fabafezadugawalibu.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ff27a348988ad852ba3931bc8adb4948/jarukaranage.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/65316977995.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b83efd2098f---bewasizumalamaginil.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/genozejobadidise.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6472ae2b45ba26174cd7397d04e0a02b/wevogudidalagesivafunu.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/benip.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5996d2f943edd3af034b102c125f7b32/xawixev.pdfIn PDF document text
    • https://capecoralliving.com/media/file/47025457894.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wakewov.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985afc44353---34239318094.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad551f0a3fb---xikebazabewirubodilog.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 16948 bytes
SHA-256: 95a1caa0cd70d9697c72eaff3884edaa41abac9e35c8d6b30ce186a0c71e4583
font_01_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 11048 bytes
SHA-256: e032702a1fcdd79f839fab5215ccef2cdc4920a467d4d9d940a3fe3835d3bf30
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1