Malicious PDF — malware analysis report

Static analysis result for SHA-256 8758124303fd5651…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 07:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6e31e328679a7d55c4c36657b3f53b3 SHA-1: 53e78b43e60e76d57d0615a6b6cdb49a22e5b73b SHA-256: 8758124303fd5651c7a99b3d8a0f11018cae8e07a1076fa09b7bc43c1d1a2f99
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests a tactic to distribute malicious content or phish users through a network of seemingly unrelated sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=litiasis+renal+pdf+2018 PDF link annotation
    • http://fosterfreezesantarosa.com/uploads/files/lelaremizepativuwegu.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/85292937546.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ekpa969diut3jfbjdbii2dqhs3/pigowarotolosarofiw.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/12847674922.pdfIn PDF document text
    • http://accronline.com/userfiles/file/62628755405.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/74247106409.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c3264c88---binovaganikidukexexinowat.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/47348929662.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/35930151668.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-5/20210805074428354829.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/xovubud.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081020e8c162---21028828129.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/12693076534.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/38732103705.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/wusonasiwifixagalima.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744bb45418a---gojegagewalowuz.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/wesitebuk.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3eb450a69940e62b714429eba4e125cf/fakudositak.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/rorirerurojagawigefilosad.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfda5ebf6f2---jepimufepepodebefe.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/lipomamuxoraj.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/150c80b293f0c8babed2c4f5b98a4277/74438584820.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a1e131ac6add08f6218772d4bddfd8c/99606178008.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_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 10832 bytes
SHA-256: 03694fdaea1a5307d5be04888c81ad20099b98e64e9e862687a11de231b0620e
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 17124 bytes
SHA-256: 35fe607823c77f6f0c80cd2e7e0a4dbe3c2a45ae45fa82285ef7ca0b9ab75c77
font_02_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.