Malicious PDF — malware analysis report

Static analysis result for SHA-256 d597fce27b0b8b0c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 05:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70bc4c8406a680b68ed4a4fbf49e2522 SHA-1: 8050c25cb059cf047732ceb157cea0ae81eee84d SHA-256: d597fce27b0b8b0cf52ec2b1173d140a4dc8b61de475759345276bac15a547bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting, likely to download a secondary payload. The presence of invoice-related language further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a81ae00b4---joxomanejekubuwigis.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/92725143770.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabce7476c---vitobis.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/lagol.pdf
    • https://yuss.it/file/vudelu.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba024510be---65503739984.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53d4980e5---56544168876.pdf
    • http://yaqeen-eg.com/userfiles/file/91322193861.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a880620d469---dixizejigejejanux.pdf
    • http://huyndaicaudien.com/upload/files/beravusomedifisise.pdf
    • http://veterinariacomportamentale.it/userfiles/files/44739466318.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7986e4bd8c697846fd5103b2d7add8ae/88169797921.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b054197bb---nimisuxiw.pdf
    • http://zrdb-drogbud.pl/Upload/file/29023616643.pdf
    • http://hayatteknoloji.com/webimage/file/92734039273.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6c63204b---48732918771.pdf
    • http://daiichilogistics.com/uploads/news_file/25870455910.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7bf0ab96b---49763563637.pdf
    • https://stcc-sa.com/motakamel/Ups/files/87358049339.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xisoju.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085cff393206---11281115732.pdf
    • https://electroagro.es/pub/files/tibafuxojegisita.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/78423614510.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+to+fix+a+cavity+without+insurance
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d4855ab2bc44aa9638e3d6ebc91aa867/27224709560.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 16792 bytes
font_01_sfnt_off0000f54e.bin
7fcda32e82d5bad9c0fb361ee3a7b553c59e0b294a920ae86b8e107b2785a7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 11016 bytes
font_02_sfnt_off00010ecf.bin
89c21aec22ce1bfa7a2a9cff8c3e5512a4a3f48cf6e9f0dc2c79f3c0ca35e325
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 17724 bytes