Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b85e24383267b9c…

MALICIOUS

PDF

95.5 KB Created: 2021-07-08 00:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2746374590a4ecc47866bdc14cdf611f SHA-1: 67be09547c9e62c0d4aeab46738cac842d79f09e SHA-256: 0b85e24383267b9c96499b48edd193d11e5af9faa285ccf09b4ac724ddf815f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://newgatedesign.com/Images_upload/files/vamolel.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/239d909cd3f0fd788c4c2c06cf1f785c/luzibilavudigivepiw.pdf
    • http://www.lnk-creation.fr/upload/file/17993333508.pdf
    • http://obasekiestates.com/UserFiles/file/pibaguwuragumufiminadar.pdf
    • http://bannhuaduong.net/upload/files/42636362773.pdf
    • http://zuche0551.com/upload/file/zofabivoz.pdf
    • https://immobilgold.com/file/vasixekedudopomo.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608132feb2734---xuxapem.pdf
    • https://oddluzanie.net/userfiles/file/witugidenegijabevo.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fmh96vr6h6e7gpibr9cf9i8omb/98170161730.pdf
    • http://wib24-admin.de/uploads/file/18599685949.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/df48252fb970faeaf76bd7641ec83140/mekebopevatujarakawuwi.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609544dd9c81c---84598500109.pdf
    • https://hobbes-group.com/upload/files/57087441832.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609612b131f15---94310567770.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608539cbda939---zizime.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8b45411d---munotugug.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca33dff1fb468e8aa86c14684436668e/5818441533.pdf
    • https://widepolymers.com/userfiles/file/kutukuxo.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mfpqpu2fhoost78d574o799g4c/82449339617.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/aaa7df97efde0e7eb5848cbdc29b08de/82903258946.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9b14d59477c86269e5fb5f55cc306eb4/zotamorurupukigatubuwo.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/37cb51efd29083b40322c34b9ca00aa9/wujowugu.pdf
    • https://vigiweb.cl/dinamicos/files/file/metimesamuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=intelligence+gathering+techniques+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_off000112e9.bin
dc7295767fd60bb0be4385cf621e749a8a9bc525552bea2e8b71b391552db52f
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 17084 bytes
font_01_sfnt_off00013f83.bin
d66ea69ffc968fe16116080429a5844b340dd9743bc401afab60d0d5783182f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F83 10976 bytes
font_02_sfnt_off00015861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15861 16792 bytes