Malicious PDF — malware analysis report

Static analysis result for SHA-256 965e5e8e6e3b43e1…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 02:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdd2a6103a5e25283e9f0c4f502e3880 SHA-1: 407bfe7633e7dae232b076f885c3e0b27e260b82 SHA-256: 965e5e8e6e3b43e1fb2f94a35df1f35933fe3619f05a8d43ecaf0a6180c24b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=items+that+begin+with+h
    • https://accuratesearch.com/userfiles/file/teporexisokejobaja.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607941b3caec0---lijomulisosizojuzefuwe.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1608cd1e318317e724ffc6ae32fff33e/65132590863.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3572a16b56ca53ca98824d8a652fb820/fomaponedunapowiku.pdf
    • http://burchiellati.com/file_fck/file/savofizuti.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/67acb0a1092264cceca5ce83cc366ffb/24127770137.pdf
    • http://gallery4walls.com/upload/editer/file/vuwifisixizovigepi.pdf
    • https://global-product.org/CKEdit/upload/files/zipalupupesevunikur.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87e88f1db---gumudusek.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e4d7141d99ac774c4f8cebeeb2f49cb4/21650986786.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/85531927596.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/10f1ef669fe41e9cf3b414960ff09999/dafuf.pdf
    • https://lescourailleurs.com/upload/editor/file/dukovufuwe.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05e92f3acbac998382164f1cbc10258f/wejevusagugaxilazoxek.pdf
    • http://essiac.cz/UserFiles/file/malebe.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ccc9569247c68a3ac77637d67fa6ca05/zasiwuvukewaz.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce56af722c7---pukelugajegiw.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fcfd8e2b---18961632890.pdf
    • https://wsbtitan.com/images/file/duxiwelurewojej.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160787420ab45e---nepizewob.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33aa81766---kisejuzekav.pdf
    • https://holocaustresearch.pl/nowy/photo/file/fipibasunowovalusa.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1181e01c04---xobozif.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098af857f59c---54640577671.pdf
    • http://albino-pitti.com/pub_img/file/97843266491.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e524.bin
c78d50d4eab60dde23be56310dc11a0e600e3941fd33c7fa553a3595158b50e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 17080 bytes
font_01_sfnt_off00011134.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
font_02_sfnt_off00012945.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 16252 bytes
font_03_sfnt_off00013f26.bin
d1c25f1749224cc0599b1dc6fa10ab248651a28d005358505136b9032a997375
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F26 10468 bytes