Malicious PDF — malware analysis report

Static analysis result for SHA-256 985fef7a50cee13c…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 08:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd4ef81ec587e1628286a26c767c7c8f SHA-1: e99f7696fa82f7bf3603639e2c98d00879e9e781 SHA-256: 985fef7a50cee13c9cf4e2807a24bf01c5ac61c882ad46d1391c9c734b4d4260
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

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://archism.ru/uplcv?utm_term=types+of+syntax
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/brpv25gog1f6pbdm0dofupmrs6/bivanademodosukizozapebi.pdf
    • http://bagiez.com/userfiles/file/gerimizoxebomom.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ncrjo2sci227ugac02j4tdhbg6/kovoteva.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc891b5c74---85452511753.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/j6jf5p5gr1djkisfc114ald3b6/96786907329.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b21f37cea---76138116704.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/tafuso.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9de902481141eaec2888958ae415636c/83843029904.pdf
    • http://nacyc.jp/Upload/file/gewolixatetega.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1ac73f4d---xizufiwumoxajijupita.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39dc235c1---11610555410.pdf
    • http://targdenunti.ro/userfiles/file/savujime.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e5ca39815---damirodin.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedbb2f457---43514885642.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d34102a48---72219115094.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/23674647012.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/7bf05bd1f5e024c82561ba0526ac00ce/90446130615.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b09d6c96503903bebb459168f7678a9f/kalojagekalasena.pdf
    • https://abugfreemind.com/userfiles/file/tetitekulakubebeximozoku.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/kep8qllrhilluldrm2v9te0ef5/48761465438.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qf70bijcj26bv7v0iqqiuis6df/wered.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10a6b399f4f6d13b7674f4817d9cf84f/naxawosusagowiw.pdf
    • http://ztkammer.at/uploads/file/zamogisiju.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7098964f94a95796f25d9421ded217e6/96782032974.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qpkfcbkl871304tp2sgerhkqkj/60548805225.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_off0000ec17.bin
cb955d006c22c1d78a1d8555ab3757ff4e4167c805ac30e376732283a18ea523		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 10292 bytes
font_01_sfnt_off0001037f.bin
212a8f7ded33d52b3d3222311364263ddb3e7c7fca8f1ee54c4128b6bbc02bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 17336 bytes
font_02_sfnt_off000130e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 16792 bytes

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