Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce9c8fe0150d310…

MALICIOUS

PDF

69.8 KB Created: 2021-09-21 02:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 13f9da9d92b4722fbb7aadd22485890f SHA-1: c6c93959147bdd88a52ef4f05ac15b4f59e2af11 SHA-256: bce9c8fe0150d310d761f35097e05759f0e76bf74466b22462214b98423933df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. These links likely serve as lures to phishing pages or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://actinq.nl/upload/file/32355379542.pdf In PDF document text
    • https://alpasol.e-giant.net/upload/files/77547667089.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f333c82a5---pilosab.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148e8418a63d---lonaguzevikiwuxutijidabes.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613316f34b244---53160402697.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/52391482590.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/29775208896.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/nefevodu.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/jimiguwerejojanemi.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/88528426883.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/80192062001.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/uud9ou4h6igm10tp25gf53b7hth5h332/37899417328.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/90541260823.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/lananexezokexape.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142be50a6044---famazobinaluwabup.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/litatevekamejixe.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/32998119688.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/37945091665.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ruwupujisavufenezaxivaz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kprjuih7i7sp7acroqs4t7p0t1/42721388838.pdfIn PDF document text
    • http://baove24h.org/upload/files/50125808817.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bivuzaruzisutuwemifovesu.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/69200860266.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/narunegij.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/61520519790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cara+cara+edit+videoPDF link annotation
    • 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_off0000b54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54C 15088 bytes
SHA-256: 32fb9982b397b1eb2f3ec5b8611876382f1ae4fd914079a452140fd6550c59dc
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 10144 bytes
SHA-256: f5cbe849c23d2124709e7d83e19cfaf2010dc8c571c8f79949387e1d6ac7145c
font_02_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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