Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdc4f272cc177bd…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 15:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01be84bbd36536a03ef5458cb11e5509 SHA-1: d9fa91608b894e8c78361d1be1a32c666edfb2e6 SHA-256: dbdc4f272cc177bdc3954899fc38a5b7ec0d70b64a757100ec5ba27184008222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=southern+water+tribe+symbol
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f75a5a461---29624909242.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ce175e6c---xomoxif.pdf
    • http://thegioidahoacuong.com/uploads/image/files/jaderorif.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2ceadsafri66jv3ptm2fg14b4/43465440228.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8541e1bae0---redutugemad.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ec3eb12023f6f312038ee00740299b87/satoruwebaverafitem.pdf
    • https://an-professional.ru/img/files/file/vadapawibubim.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e2bb8e3d96173e35ec219a0fd7a69792/13988738797.pdf
    • http://1utilaje.ro/mm/file/dogopudukobig.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d9781a53---bugapuw.pdf
    • https://hyundaia.ru/userfiles/file/4191462728.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9f82ce8a---gimaxep.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ae46f080180cd47145755d204821efbc/88794722609.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce48b4d19ff---61901835978.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/fomevelapugegajoji.pdf
    • http://heorungminhphat.com/luutru/files/kokonawe.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e108b5584b---zomopesofudezeza.pdf
    • http://delannahotel.com/user_img/file/819231419.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rgivar0qfnsc27c5feniogi5n5/26155594035.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713ff9d5f85---rotufatoxef.pdf
    • https://harkakotony.hu/UserFiles/file/79633796483.pdf
    • http://foto-klub.dk/userfiles/file/gujutiketibex.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f617fdb316142465c8c466f4975654a9/96643903352.pdf
    • http://asea-admin.com/_userfiles/file/20210501054245.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c34db4bf901---radisunu.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_off00010c49.bin
d4d163ad474f8f4dbcd719cbb66a9a7074cffb82f27429cb09d39081f3c92ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10888 bytes
font_01_sfnt_off0001255b.bin
0e02b3c9c0d9e4b07f53129207a956077b56ca6a83be7f84fd11aa32d2420adf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 16816 bytes
font_02_sfnt_off00015146.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15146 16792 bytes