Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7ccd59b4cdba81…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 04:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbc6a6c973ef936f0dafa7c5ca5256cc SHA-1: df8ce804fd627af783c57ff3f269994aea1a7824 SHA-256: 4a7ccd59b4cdba817bbe574c80a81cb99af3c4511717ed45c2af8b12a3e1cb6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=yardmax+log+splitter+owners+manual
    • http://elite-nails.pl/Upload/file/vakenutozu.pdf
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/legoginenavenen.pdf
    • http://hitecds.com/userfiles/file/dafitabedakavevegufu.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/3a3kpdasj9tk3v541hs84bf0r6/ligavuxevisowutumo.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/59587469057.pdf
    • http://asiavent.com/UserFiles/file///kivutekeb.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r9n56khl29u8qpgrqse6ih50r2/dunozivejujutevefal.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eb015067937e517f0b8e0a2e16e9ac8b/tuvagudejevemoz.pdf
    • https://abeess.com/userfiles/file/78630307569.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f0495d25846---46697671911.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e6eef6c4a930d8502c9a583ce5eef1b4/68714648542.pdf
    • http://phongkhamtamthan.net/uploadeditor/files/75218009408.pdf
    • http://color-gateway.com/userfiles/file/jojujunifitefowep.pdf
    • http://harryreichert.de/uploaded_pics/News/file/sovirula.pdf
    • http://quickvideo.nl/userfiles/file/92481179090.pdf
    • http://badgerhillfarm.uk/94902731167.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a737e4f7703b74e9710dcc79944c034d/woxufifezokizejasil.pdf
    • http://househouse.it/userfiles/files/powivetisidulazigud.pdf
    • http://duhochoangthanh.com/upload/files/42828947664.pdf
    • https://acronimocostanzo.com/userfiles/file/22202353198.pdf
    • https://juvelyrikoscentras.lt/Files/file/48043662780.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210529_B97410B7B9554AAC.pdf
    • http://gshosnab.ru/userfiles/file/nigeliwimewitufesi.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0ba4de7cab49fe6a02dc2c2f9ade33cd/berepavejojegoki.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdbdddfb2---kisowirorupidisivaporu.pdf
    • https://cottonweb.net/userfiles/file/rutupukuwipojumomivife.pdf
    • https://aawyx.com/sites/default/imageuser/file/takanazekemepe.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_off0000dd03.bin
b996f74190f1832ea338d127eb5a75f496cfc259205a6dabc9d7ddaf04762c51
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 19136 bytes
font_01_sfnt_off00010dc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
font_02_sfnt_off000125dd.bin
8223f545a8ca2d2ca2933d1f0e662dba2220ddf414c1bba72511499bd0b432ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 11004 bytes