Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e96a2db6ef6022…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 18:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 988275fd421a8b210e8b0888cb8e790b SHA-1: e99cacdea5b540b47e067db863e41afb02487142 SHA-256: 73e96a2db6ef60229826fb763544a45b508fdb93e1253ef860fb3795e31c95bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious content. No scripts were extracted, but the structure suggests it's designed to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=bad+ice+cream+2+apk PDF link annotation
    • http://soles2walk.cz/data/file/28332497875.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613386f35698f---35449052156.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/fasafakuleg.pdfIn PDF document text
    • https://alpinashop.bg/files/98898038863.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/38298527714.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/63653940274.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7e10babc9cc2f516a09989bfe0966954/66833189491.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210910000121540647.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/davepepipalonalikuwa.pdfIn PDF document text
    • https://agros.net/uploads/file/kipoximexuxi.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/golefagowa.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/64712500723.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/kiforiz.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/9528541833.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6e3345fd54077fda6e7c1a58909b7d85/wonakof.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tadobobujovifuvudiput.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/karudevasutodop.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sefubiwokiru.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/vojomopirezifopirire.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/41480033919.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/galafuvaxatinejorukufu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/31984851760.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906042148.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_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 10404 bytes
SHA-256: 94466f999ded5716eec331c31615c218d59ae9bb5736bf03d67ac39128b88649
font_02_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16636 bytes
SHA-256: 70be33b31f56c7de9efa88e2fca9f1b7e2c6d0758bf32f54a7cc01d5d52c8b7f