Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2f1baff92876d8…

MALICIOUS

PDF

102.6 KB Created: 2021-09-02 00:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1197c9c9d8a6d747ab4cff6c00eadfe3 SHA-1: f9481c8dcf8104b2ef5bc950faed7b34917f8739 SHA-256: af2f1baff92876d82911770395570540be25cf2a394426f2f1cd19f65ced54bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is unreadable, but the heuristics indicate a focus on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alteanetworks.fr/img/file/42522695717.pdf In PDF document text
    • http://hangtatmj.com/userfiles/9523906902.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc0d6d9805---kitiwov.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/55446284430.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/42049848423.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f91d5d301---93000342053.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/42141651668.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ad9368b12318babb3de533f0f8d080ad/jefejavuwepud.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cab22e97417b11a6d79f46a5510a2373/nalegavovagexipesajokagas.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/74190027029.pdfIn PDF document text
    • https://subded.org/userfiles/file/dutapidubudeforilijirej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce22f872eaf---33508551722.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/68edf84e60422363124185bbb086e3aa/dewukovujapuzuleruvam.pdfIn PDF document text
    • http://sparkpro.lv/content/file/xikuv.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/8239134177.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ca12827e1166cb18ea2b7458add96bd6/lidegijokojipugakevujabe.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zaselekanodutigabozogara.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/zifawepumaridogurisote.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ca077376f---xepumekapikude.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/dapukinefibibofuguzo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e2ica2793v758o55h2gdo1uujc/59698019225.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1201f290---tipesegelewi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/m52juh0qki5bvbosfm8287b852/wipajuxobexarelafotinedun.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/85227962368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=coin+codes+for+anime+fighting+simulatorPDF 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_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 11052 bytes
SHA-256: 4365b4cb3f3c8934abde7891f39bb2385f6c52806fba70174d6e7bbcbad4a2e1
font_01_sfnt_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001582e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582E 19812 bytes
SHA-256: 52a99c8befcc274a3ff80cfaed28b9f6fc29437584eb61262f8ae5f1a1cfc6a9

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