Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06840d0e2d3ae8c…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 13:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b44bf39238e5118546e3c34440380267 SHA-1: 3e286198448fb91b4f09aeef0132f08db5882eb9 SHA-256: b06840d0e2d3ae8cd8e8deaaaaa9fbd7eb93685ed540303bab22fe14080590b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload storage, with multiple distinct hosts and links per host, indicating a likely attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59689209ad---nepukopi.pdf
    • http://aaykpn.com/uploads/editor/files/38872213505.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3e2baa040---rixokononil.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/uhmhtbs9sjcpqp3cuodrlct5oa/98199019446.pdf
    • http://agrobud.net/uploaded/file/57601622122.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2634f447ac---34986626437.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871563830c---vijurakalazufekexukukipaj.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f3e77a9a1---76177356568.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jazaduguwu.pdf
    • https://serwisnawigacji.pl/userfiles/file/41753604608.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafofomusetibef.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c48392888---nitaronefafo.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607648ea772b8---50530530237.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d8f8c3a7811a26f8971862fe657141c4/rizikesumajimokadixe.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a33d535ad9c91fb156328132f3dc7512/rijolusujibiletexugolo.pdf
    • http://penzionriverside.cz/files/file/tumijiburujazawubunase.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144a30f723---xagokuvibijif.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d62cc52605f8b286391357196b0ed3d2/84445381537.pdf
    • http://china-zub.ru/userfiles/file/40099875806.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a5d6ab79---numuvanilotivujokutok.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b276fbe9fb5---72176757777.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6fa06402---vedigolevuvalirusavorenuj.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/a1qe76vclt7cn2rahquhrh9r9q/tusubelakufekadovoxe.pdf
    • https://angkoronetour.com/userfiles/file/xutaxunaxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+does+a+computer+chip+work
    • 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_off0000e9e2.bin
43f42de79c3ce4501b4f6ba8188621d2d54d4342c40392af05d174917167ff11
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 16852 bytes
font_01_sfnt_off000115a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
font_02_sfnt_off00012db9.bin
10287485fc4ace3d40a5f4382de8f524e6940b80d0c702a8eb27463bf0820d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 10900 bytes