Malicious PDF — malware analysis report

Static analysis result for SHA-256 9967b880ce662f5b…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 23:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d040300c1b9f693341260ed3fcf2b5f SHA-1: 4e6d82d17f512d7b3b29155c299af3a49ebceed7 SHA-256: 9967b880ce662f5bef44bd58e589c4cb10ea24426b5eaca4436167afed83de1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or exploit browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://decom.pro/admin/ckfinder/userfiles/files/miloxilodidimobopanis.pdf
    • http://studiotecnicodavico.eu/userfiles/files/98208103037.pdf
    • https://gad-elhak.com/userfiles/file/sujaxugozesofovunevebex.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b9962f83f---6041472847.pdf
    • http://tomei4x4.jp/js/upload/files/44330301512.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cce2eb83898faaa0f151a9fcfa1217d9/93389351125.pdf
    • http://hncastlecable.com/d/files/rodojalopebezasi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kgg96cdg76bl1d0kgpd8sku2h9/durabibavo.pdf
    • http://cesurmakina.com/userfiles/file/narekanunewukela.pdf
    • http://wonderpanel.com/app/webroot/img/file/36367155476.pdf
    • https://europartner2.pl/uploads/xovutixexedefakaguxepiwi.pdf
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/41880247158.pdf
    • http://0965818789.com/CKEdit/upload/files/refukukelorogulugaraxid.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173f597d4a---51213703062.pdf
    • http://ehoron21.mn/uploads/files/sufiwezo.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb6f2eb7f---91259454505.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e32664e5963dfd921042a4f81de451f5/44227148870.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d61d30a3---xodogolamiliketu.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11646e724---bejozerexix.pdf
    • https://efsanepin.com/calisma2/files/uploads/61265334274.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=indesign+cc+2019+shortcuts+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_off00010dd2.bin
3df1a7222650692189c232094e478e9b63c29a95abd1d008d7021bb79ad659bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 19080 bytes
font_01_sfnt_off00013fe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE2 16792 bytes
font_02_sfnt_off000157f9.bin
5ac3eb3f05d9c99c572d728e32fce00c6fce6dcab89242ed60f8553931c7c262
pdf-font-stream PDF embedded font (sfnt) at offset 0x157F9 11204 bytes