Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5532e255dc49bab…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 23:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b2b83bf014eb8a5cbc791448fc2f799 SHA-1: 97e4692734c20b208ee9948eefdfe27ccb47aa60 SHA-256: f5532e255dc49bab6e3fe37f71cb699193d7e0b08ded439f23d58bd13f3f9ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=patwari+admit+card+pdf+download PDF link annotation
    • http://remont-etalon.ru/upload/files/10045016862.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f649b42c82d---72271129439.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///potajupafagudisonu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2n08jso7volnsjpa6hk9ug3sc0/nometexivijase.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/94478999048.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5ff711d99---50993625177.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/16986294501.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf86618a6---25084248379.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/add4d7afdd6dcaf15d0b8bf0b35e1331/6802912374.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/9203995504.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8bdb4bdd---3899096624.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aad84a0742a---54074128661.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/nusutu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64490450464.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/48701291860.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/6019040698.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/74881471844.pdfIn PDF document text
    • https://lasanisports.com/files/76008955442.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/aqc2a17npvqosu5bq8mdu18ffs/7120318446.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/41770396630.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbb06fca0---wowubebifodepevavikokodo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/736kmbqs82hjglp6u0egb9r78d/67122780525.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d302552094cee88080873571b08298f8/nibujil.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5f5e04938fe41462759371123ef967d8/sesusapamawurir.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/jazibulekajizun.pdfIn 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://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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 10568 bytes
SHA-256: 19516f83b3ff22f9ee180dc9b1f8d8789d6e487d4ebf5711cf4c71846b021f01
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 19344 bytes
SHA-256: b20ce76435c00b68944f6fbe6af533d1160e2bd854937c3c4a097548593c5efb