Malicious PDF — malware analysis report

Static analysis result for SHA-256 c161ef9ad231275a…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 04:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f171e69e6cfdeaf3450e457cc19d910 SHA-1: a05dd381460d476879027228679cc985524b9d15 SHA-256: c161ef9ad231275a752de2dc960be9883f86fb60f7fed25171130902c57d693f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The 'PDF_IMAGE_LURE' heuristic suggests it's an image-based document with a clickable action, typical of phishing lures. ClamAV and ML classifiers also flagged this as malicious, likely due to the nature of the embedded URLs and the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=watch+shrek+movie+free PDF link annotation
    • https://sbsoftware.ro/admin/userfiles/file/96954931965.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/tibutosoz.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/jasorura.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/41311885354.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fulavokizijonomenekufufu.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/dexesegu.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/55923697538.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/jorojaguzaru.pdfIn PDF document text
    • http://gnox.vn/upload/files/57750800249.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/s35f31i57il3jk439okht43fgc/46576336516.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/napedidibevasuxavugarode.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/41807654061.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4a8e2e3d548c0b728849a4ad020071e4/povomubipubivikav.pdfIn PDF document text
    • http://lactopad.com/uploads/files/rurogimake.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/94331736255.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911164311.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/taburobekifo.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/xadewutefijud.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/puwafonebexofapoxex.pdfIn PDF document text
    • http://khocabien.com/uploads/files/gelakemupixifidakox.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/xajajanaguvoxu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b23d9cd8cf5162aa971f46792b8475a/rutejipi.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/18871912675.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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 10604 bytes
SHA-256: a65881d3f9f024194c49d392d46d800fd357ecef3cb07ac8189143e7d506872c
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 14320 bytes
SHA-256: 2783618bfaa99b2781dc9a209179405f347d4f132a6b1c6f8b56d6bedc056d96
font_02_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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