Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d53bbfd99cce5f…

MALICIOUS

PDF

83.1 KB Created: 2021-07-13 19:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25402e674dd01cc862fcbcf83df14f6c SHA-1: 5243551a47ac9112525c6ea88858a1a757c99bf4 SHA-256: 24d53bbfd99cce5f91abafdf49252fcb8f45fa423cb801dfe9b13bd2f870fd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://txextremecarts.com/userfiles/file/9775616469.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/lavixososoboseb.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d696ba5de0---21191815112.pdf
    • http://toshiteriyakiburien.com/uploads/files/linuzaretumudiren.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/9cc3b753f872cf53a2b24e74d94fdf31/gefixugufi.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160730732f15cb---mizogixafamaludijoz.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2m11u758o10dhgn1jjjcu320ks/fenuluserabij.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7fbbff0b0023b96c7637ae813187ff4c/redomogutivamujanutud.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9b4f99a1e---muximepari.pdf
    • https://ivanda-commerce.hr/userfiles/file/95277641822.pdf
    • http://www.vikingmaterials.com/img/20309798241.pdf
    • http://kojeneckezbozi.eu/userfiles/file/71225052362.pdf
    • http://nextgenship.net/upload/file/20210522162168317768.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9qvu3patma86sohcsgvmam515f/4662125956.pdf
    • http://dzstock.com/Upfiles/file/sakuvevala.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160762241bb844---69337061668.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/mabuwidewisupujemiwu.pdf
    • http://ehomeforeclosure.org/images/file/38669486277.pdf
    • http://aven.su/userfiles/file/43738967922.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/61509505888.pdf
    • http://luingpyrex.cz/foto/Image/file/11253494342.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bffc47983---39566354155.pdf
    • https://clumba-indoor.ru/files/files/kokeminelalisamaz.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e24de27a---91409448669.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cover+page+template
    • 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_off0000e44a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 16792 bytes
font_01_sfnt_off0000fc5c.bin
858ad5948a298c1fe79a5089f93eb018b8b7daf64bef31f875b865d99653cb13
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16796 bytes
font_02_sfnt_off00012828.bin
fe5181f40a7a7d0aaba2b9c731856ea43c72e89b3b0bfffc77f7a2d35eacad06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 10328 bytes