Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d554bdcd8909fa2…

MALICIOUS

PDF

95.6 KB Created: 2021-07-23 04:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc7de7f06abc7ec9e54a878511c56a3b SHA-1: d6d745aaa4a8d48f330f92b71db3bce45d316e97 SHA-256: 3d554bdcd8909fa2e82a2969d49f83d03bcb7646908572cfe1c4ee8e9f855dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdebc078cb---56267674351.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943b86b8a8---53321895903.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584dd2f7ea---45475553619.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8kmhi5r089uc443m30fi0v38d6/madepegiwesuto.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ofhb6khr6hm0suj79fs9827v32/75958971505.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/gomid.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607869353b8f1---32691447723.pdf
    • http://ya-ke.cn/admin/upload/849679582.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c699cb8d9a8cdc4b8ab2b3bf34a72d2/muramivelip.pdf
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/25639060972.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609333fdb7b62---samekek.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/96300786890.pdf
    • http://digitalpolicycouncil.com/imagenes/file/kupirexuxetewirilobiz.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd53971b687---masavazuvarem.pdf
    • http://cuacuongiare.vn/upload/files/wivogirozogovufalamubad.pdf
    • https://everestart.com/images/stories/file/96580804862.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609031f477706---28363805002.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc3939e15b---ledakozubudafinej.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/f1q1en6lah57rflb1ifcmnevj6/subaroduromuvegozosojamep.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/89158469259.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/62a728ca5e9dadd472bc9c35e27f5919/vopuma.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ld9vlv1iokl0knv9s3b85l62g1/liwagubiwok.pdf
    • http://aftckwt.com/uploads/file/23818615138.pdf
    • http://liebherr-tr.com/userfiles/file/31926452451.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/28922303797.pdf
    • https://grupo-kayros.com/userfiles/file/sosisam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=introduction+to+computer+logic
    • 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_off0001134e.bin
0ce68b17283d8d88c206e79c56e52ff98f2f4d6c15fe45604c106eb3e19ee0ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 10580 bytes
font_01_sfnt_off00012b2a.bin
32ca27678a89298154fd93dc6809d2bbd6eedbcfdcedace362e656a316f01178
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 17224 bytes
font_02_sfnt_off000157c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157C7 16792 bytes