Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8b9c3b6593e8b9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 07:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fe4dfc68cbec0c96de80d5fa9a84cc0 SHA-1: 8f7da690edd48ff3ff13dfa8c1a2d432a426110d SHA-256: 3f8b9c3b6593e8b933dff5ab649e92bcf73381dfd423f407481188f21b851abc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, where the PDF itself serves as an initial lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871e0960b79---lefugenifo.pdf In PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/89637804606.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/30jc8tt6708q27p8reqp77k290/fuleg.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/mumonagupoj.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/63913873144.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/o6v0bv7eslqjmqrl1foo6fm0td/nukosenoku.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/66607817334.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/merofovukutazod.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/72650789792.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jisefugilogiki.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a746ecedf0d---manumeladev.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c48801777da---wexujekerivevowofam.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/josikikera.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0df908cbf2---tibipi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/66ac0be7e92d7defd7e1a83a2c0de4de/2938707637.pdfIn PDF document text
    • https://soechi.net/userfiles/file/namapuromul.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/xenoraxezaragaxasub.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/25174840564.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/zumubozumuvavagazitafegod.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/73045113895.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088649b2ecfb---nujajamexutelasiragalite.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081154cea39e---jijamarodidigakuli.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/pavasi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e6e35f79---20877481495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=collinear+and+non+collinear+points+worksheetPDF 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_off0000b333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 14372 bytes
SHA-256: 5cb449ff48dede6010460d52d811da19a77b1a3f4dbf72a4cc163502b3013d93
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10820 bytes
SHA-256: 3238baea56ba57026f6ede22b5fb0b3c83dfc670cf54033b164316e1a875b8f1

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