Malicious PDF — malware analysis report

Static analysis result for SHA-256 5542741445273500…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 22:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a760381aa6d2717f2de860bd8eebd64 SHA-1: 1539077582e0861afd11a300277122ba1800133c SHA-256: 5542741445273500cdfc2ff2da091a940ca607dd61648aa2aa3d9bef1b4bd2b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of PRC/3D content is also noted, which can sometimes be used for obfuscation or exploitation in PDFs. No scripts were extracted, but the overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://umffz21.ru/admin/ckfinder/userfiles/files/fedujep.pdf
    • http://imaginove.eu/data/Files/29672869951.pdf
    • http://makesomenoise.hu/upload/file/79461390187.pdf
    • https://cartolmania.it/file/40523744877.pdf
    • http://huile-de-nigelle.info/userfiles/file/70614373721.pdf
    • https://gonguyenkhoi.vn/upload/files/jemeravuxipifu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/43fc4ad64be61fc0eeeddd0f56d474b7/ziril.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2da48223f446106cfdd373e00e24a267/ripozovadikot.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8af54b746---52129655848.pdf
    • http://cobansut.com/userfiles/file/712159363.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e5385dc1---53909836167.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3bf3c0b3---56799373940.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/karawibenajefevijima.pdf
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/davulupuvatinedevikazewa.pdf
    • https://a2designbg.com/userfiles/file/wuvezivog.pdf
    • http://gensugroup.com/upload/files/89295055962.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+focus+on+your+studies+pdf
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/runebologewezanuw.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_off0000e35a.bin
8b2d7add789d2de49f6d15707cb226fed5d7d67b6e3fb058e1ae7adebb40b59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 18052 bytes
font_01_sfnt_off0001121e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 16792 bytes
font_02_sfnt_off00012a35.bin
cdb78cda1a876a2a64c02a0b427e27de6353a102da5484c186ecc3a6cc5ca58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 10696 bytes

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