Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8f663c88599a17…

MALICIOUS

PDF

103.3 KB Created: 2021-07-02 14:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f459aa18f9e9b11f5a6f9468ff5a282 SHA-1: a5c2bd5485a6b1ede4f63fe78d9f7dd6e25b797a SHA-256: 0b8f663c88599a1783247b0fd6443236f522bda69d01984bdf9e0e7bcd712e50
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ar8fdaa5vjrhu78l4jpo6nhms0/42587872031.pdf
    • https://pharmnet.cz/ckfiles/files/files/vuloditegesofasirados.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b3239a6f7---valomiridatekidisu.pdf
    • https://acronimocostanzo.com/userfiles/file/sigegarutodoxokoge.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9aaf839f3---21997818097.pdf
    • http://cpspcb.com/uploads/files/69930875551.pdf
    • https://numberonerevolution.it/file/samexuvepezu.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f0be6f90316c52c357aa80a06695a58b/bunikowaji.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tnnr61d3pc2cfteq4t90ncu0s7/47515665908.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/10809138336.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/loregarag.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41b7bd6c3---zixetisa.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12305f1714---85221763688.pdf
    • http://vieclamketoan365.com/upload/files/44247657462.pdf
    • http://naturallabs.de/userfiles/file/8474636973.pdf
    • http://nissanotogovap.com/uploads/images/files/nuvijojeruvemo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078327446927---fizozuxalapufixine.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c3abde493dfe277a5ac7a4a3f6bc7dd3/fowupevikov.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a338585d755---46372346746.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0396463ff---kodewabubeloxovafibaxu.pdf
    • http://merlegdoktor.hu/tmp/wipadexikulawawosimevob.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeecd6c187a---80258147708.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609247c2a5fe0---lejukugevakipe.pdf
    • http://tetraeng.it/userfiles/files/88782979298.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=words+with+p+and+b
    • 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_off000133a9.bin
eab7ccd8ea6cd9d62581e1321c8ef15a9345933a44cb498affd549ff5acea87f
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 17320 bytes
font_01_sfnt_off0001609e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1609E 16792 bytes
font_02_sfnt_off000178b5.bin
91f9c6a2b095c5ec6ec1f805280b27a318cb1296f83892970fa39a31337b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0x178B5 10528 bytes