Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e554275103b191c…

MALICIOUS

PDF

75.7 KB Created: 2021-06-10 16:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 614e85fd7885be9d874039b64f74eeb4 SHA-1: 6022698d2e7e05bd530a75f84f2f126cd39dd0bb SHA-256: 7e554275103b191c0293bed18869e8c3b1369c95a358116e69d29b1919930142
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as a phishing trojan. The document body, though obfuscated, appears to be a lure related to song lyrics to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://inwebjor.ru/uplcv?utm_term=jon+b+ft+2pac+are+you+still+down+lyrics PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mus9v0nl6b6rnhjvs8a4ndpja6/tidesenobexigagunoriba.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608488f2a4f21---zafabolusetozotetalasageb.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ugcr0qlf9b1seae7sfnbmdm2h3/fexavufifijuviriberigig.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/gomuvaxixepuwuxogereze.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df82f913ad---45551375671.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/85876255841.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdee09618---94839908442.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kakumebewemuzafotawuded.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/muruxitopubivonofikuzux.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d9e203144304d884d6f00b97211bb3f7/vikeg.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6e503fdbc440d23d14a14a23be4232d7/1466874622.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6a523ab18215c89292b60a2790f14e40/lobazigivapafudakexipe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084194127936---51659089879.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d339608500---xiribobamowupinegezi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082245b5fb00---27815063800.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0129701877bc2e5ad631f78ca6fb88c6/79924388617.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/jasasazefexat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 5604 bytes
SHA-256: 9e95b2582526f276af7cf5f88c2eb2a4a1ad536e540840f764818861ee2d45b9
font_01_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 10864 bytes
SHA-256: df8c4536f2fdc372ed007fc2748b96f407835486384528deafcf97286dbe8e6d