Malicious PDF — malware analysis report

Static analysis result for SHA-256 9642578e42e854ba…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 16:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 618ac440252bf41be6fc14dfaef44168 SHA-1: 43c8524439844bd7344cd92c3f87cb34298fedc8 SHA-256: 9642578e42e854ba3cdf78811fa276369f4f7dfc19f9c5d42ef61c4844811228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=gradle+could+not+get+resource
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22a654c85---38811481716.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/75899129649.pdf
    • http://naosgym.com/userfiles/files/dubipolifewududan.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06d9c4dbd---19992442080.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/saraliwaxusa.pdf
    • http://epodhajska.eu/UserFiles/File/nabudubo.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c2314ee00a8c0112c1e99f5e8cc07d4f/towezoge.pdf
    • http://karat-dobremiasto.pl/userfiles/file/206130242.pdf
    • https://xn--psg-9lac.hu/files/files/96320226847.pdf
    • http://badaranquehablar.com/userfiles/files/netitapiluvo.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/02ssh8tbmc49s47emeo7arnj03/lajesufa.pdf
    • http://lammermoor.net/imagenes/file/15328701738.pdf
    • https://millinerandassoc.com/files/file/megisuzinolilewewakak.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xutipoforexa.pdf
    • http://www.lalorraineperdue.com/documents/47337036961.pdf
    • http://cgl.lu/userfiles/files/56955669596.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0ded50e22c9db61d0312863a7b25b669/tidoxomidabejoxukefulirud.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bcd153dcf2357af8a8d1bf6924454de/tinetakutosinapopo.pdf
    • https://shiokuda2.com/contents/files/90644911249.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a95ede0f1bee786023f0653bb2b10c1d/deloporamugir.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/firokutewexidorakekurufi.pdf
    • http://sgrappresentanze.eu/userfiles/files/44035817202.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_off0000af9f.bin
24d84f6efc7ba8e89507abb8bf067fd6b2cbb8955753d6433bf68b94916db563
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 10592 bytes
font_01_sfnt_off0000c7c2.bin
92c8f1939c994da9e0b1494a9e524f01d72ad9d19a44e307cff73a7bcd990037
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 15844 bytes
font_02_sfnt_off0000f01f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 16792 bytes