Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ffa56efe3180ab…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 00:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7744bad9fc9de373af1f4e5164ddfb10 SHA-1: 8feb0b23e0a7017dd1f372024f187a54f51620dc SHA-256: a9ffa56efe3180abd2c936a4430e3597815ae9a548014d6ef6f7897aedfb5188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://alhouti.com/userfiles/file/25913563819.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/35960775926.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a487b13d2---filawikenabu.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/414d248c128753aea832ec9e3b3e9d6d/89690848504.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa44a14e8c7---10854757323.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080848aba6d2---mipudonawavazox.pdf
    • http://coffee33.ru/archive/file/15415522990.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/rezavifixabobe.pdf
    • http://dzbnf.com/upload/file///30861591834.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/de3e8849c10ccefce5171deb0cd061f0/29614627309.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9ef698cc---wizizadipovudamo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928050b0ae8---19809111858.pdf
    • http://ajk-opakowania.eu/upload/fck/file/jafedewogafirawa.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/liwajosuritegavirez.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f5aca662165cde2fc4c04261433f66d/60009511789.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4fd606837307653ebf1d5b447cb1715d/62242977525.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e94975cf---lokixoxegibajulonosuxeto.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bacaaa50fdf---281398778.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87db3b6c74---futebuvudeg.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b311679280---46695910655.pdf
    • https://computerzone.pk/file/51745315894.pdf
    • http://fygl.net/uploads/file/210525408172.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdffa26ed7---51271619687.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=convert+30kg+to+lbs
    • 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_off0000e881.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16792 bytes
font_01_sfnt_off00010093.bin
dc902fb839ed45edf98390e288e9d87240f7ee854d737708b675da8d8446e0fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 17068 bytes
font_02_sfnt_off00012d47.bin
07bb20074690159ceb98527ce4fbcc3946ef41e85aa7aef5e3cba4645cf957f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 10652 bytes