Malicious PDF — malware analysis report

Static analysis result for SHA-256 f135f2f4bb7a0b52…

MALICIOUS

PDF

68.8 KB Created: 2021-09-23 16:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed046c3efb0c8001275b82555eb1d5a9 SHA-1: 764765c966a7b4e3937c09c95e5d62aa679ebb0b SHA-256: f135f2f4bb7a0b52142d24428eea2092553eec9584766c0bc1337831541645a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking an embedded URI, likely for a malicious download or phishing page. The numerous external URIs, many hosted on compromised WordPress sites, reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=windows+10+full+version+free+download+with+product+key+64+bit PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a0f4e4446---7725568452.pdfIn PDF document text
    • http://gro-felix.si/uploads/6505148468.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/90125813089.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/segubesozuvarixixolejusij.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zoxedovowa.pdfIn PDF document text
    • https://ottopianos.nl/files/zisapefevatupefiso.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9dqa2oged60fjjkg3f5j5i0e38/28208623887.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16319117489321.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/60891001517.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/87406710153.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/28670107690.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/wonazawobusowukudagaj.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64300036179.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zumipum.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fffb7d58---83087668465.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/51557529073.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/zibexinenepefatof.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/munewimapegufevulik.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/livusawatomo.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/31964346813.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/388929546.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/89469198565.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/xososudoxonexaxugiko.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_off0000ade6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 13644 bytes
SHA-256: cbae15bb02c4dc3379e3fd7bb50dae3940604cba5ecddd381c07f3156c1d7381
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 11728 bytes
SHA-256: 9736cbc91418e855fc06b49f1b513bb1b37302a7efb83463ee82dc53e2064bf4
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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