Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ae99c819d5715d…

MALICIOUS

PDF

78.6 KB Created: 2021-06-16 05:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 70682611aaab55344d10cd61fc1b886c SHA-1: 21288c335ccd14ab400b573e8911b4be5f26ca0c SHA-256: 74ae99c819d5715d66e2d5250d6e4573b12cea22cdcc95b3914b29fd3a3da6ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various compromised WordPress sites and other domains, likely serving as a lure for users searching for game cheats. The presence of external URIs and the overall structure suggest this PDF acts as a dropper or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=simcity+buildit+hack+pc+download PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607890522d106---75691237013.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c374b0c0031---83308057174.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607172e7f262a---ruzijekuwasugerowuxugug.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/19c4a2ea37f18eea65b7c97e19f5cad0/98909026890.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bixusefu.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nolakude.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/65458875466.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/tinegeres.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827468c81aa---pixozuledesanewujetebeb.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a752b3452206a5e8024ae3e5749a2727/57955866790.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160761447d9de1---45160586481.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/658e85d5151e2d1b6a01507c72201515/bexenuwapapowap.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4ffa7285022f45a412942943dcc50296/nedozuzoxofafiwelusetoso.pdfIn PDF document text
    • http://ahchala.com/img/file/92959478933.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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5540 bytes
SHA-256: 162fe28fc0b5b7411c6dbeb1ca23bd020f2704d6522f159c6d15494e062ee249
font_01_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 22576 bytes
SHA-256: 7272d61f2a36d39d891b63a9c9edcb23d921bf51c3afe425429d6b91e7e16b32

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