Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f60dd9966d97a8…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 20:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f71a6050f3f5051b60008388eac2da35 SHA-1: 6746f364a1dc23739c39dd90d954100ec7929c43 SHA-256: 25f60dd9966d97a87a7a940013bc044b3e2025e4ce04116541320a48aba8f97b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary goal appears to be SEO manipulation or hosting further malicious content, as indicated by the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a1a101a0165f6e5b4c4c850443f1cdce/97996465821.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2089937d19---98878643887.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a06d1a29d8c1c8509c228849d52b104f/69255202316.pdf
    • http://aarogyamedico.com/userfiles/file/47808865858.pdf
    • http://www.tomasjelinek.com/img/pub/file/redejusedoz.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a03cc1f66aec24fa16047459c8215e55/86189193739.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/53eb88e46d7a84d16c998ecdadf5e845/72481098240.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/50133512604.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2976a475d21c04003f3f9fafdf8ef6f7/6246485964.pdf
    • http://2ds-creations.fr/userfiles/file/zubumivopefunonujule.pdf
    • http://100gastro.cz/soubory/files/tikosobi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0921eba307ce8ace36ef429bd8dd638b/52651368540.pdf
    • https://oklasik.com/ckfinder/userfiles/files/32423495358.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/362ae0a3164d8f8b489acf99c1255bd5/wexuke.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d34fb6c9a61---sitabopifiwugevori.pdf
    • http://55thocscompany.com/clients/62662/File/38273310367.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b73163b9---41847585247.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1b89bfa81100a1fb831a11370ba7767c/tinesipejorelukezugipami.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff74854034---1632049116.pdf
    • http://rts-3.ru/upload/files/ladegorelunowiludul.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/48f3b6458e160f2acfe8a3751ca448c4/vamuxerefemotifafozebesad.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99f4ba0e3---zitiranivorodumuzisi.pdf
    • http://bjallstar.com/upload/file/740871204.pdf
    • http://al-bandak.com/userfiles/file/lepowimafuxavovonogax.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/roderimago.pdf
    • http://biaikatolikus.hu/files/file/82815281806.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+add+a+calculated+field+to+a+pivot+table+in+excel
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8e.bin
d7b4484477df935ff0d738ec26f793ed8f37204bce1e36d843bccfec9989f4e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 17320 bytes
font_01_sfnt_off00011b5f.bin
f56fc7642d85a6e7d0f1da4f70aa15fcaab34c71488283090448e3dbaad8efe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 10828 bytes
font_02_sfnt_off00013448.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
font_03_sfnt_off00014c59.bin
51714ff06e1f28a507f088498e5f1ff75863a3f440dffba4e7475e78a52fad9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C59 17652 bytes