Malicious PDF — malware analysis report

Static analysis result for SHA-256 f856bfbbc3520158…

MALICIOUS

PDF

116.7 KB Created: 2021-07-30 07:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0865a824a9ca216770134745dbbdd5a1 SHA-1: b532190896441dfa69166a57bbff14e2256c30f1 SHA-256: f856bfbbc3520158957891ff35f84de718cf2e50eaa6c1bae9451ddc15ec4f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the URLs likely serving as lures to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=surah+yaseen+sharif+pdf+download PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/9710338815.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mkttaoa4q0bbsj8b5030p3dq01/dadunip.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelimamojofi.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c434af4a2df---sevatuxevodanisivij.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3c1db92d7e093a2283ede0cfe4d2986d/jomisarab.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/sifogininusemokewibuzare.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210714012753.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5bda50d765c580a92d7e9bcf3b172aad/fugizavoxoja.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/goseronidowem.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/53128842576.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sisivumawig.pdfIn PDF document text
    • https://bio86.net/fichiers/574049315.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf53a68bbe---82755145018.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/58859566bbd86fc978083800dc39908a/pulorabipugikexaritew.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cb6bcd4963e43a41c4201f0edceceab2/tonapetoduvax.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/75082698158.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/15809558438.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc90ed3913---karebefakifoxasatonabug.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160715f4c08a94---kagijofevijifobimo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/44379198795.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/52913572337.pdfIn PDF document text
    • http://dzbnf.com/upload/file///78054913160.pdfIn PDF document text
    • https://wrd13.com/force/file/ripije.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/nizunilo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001695a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1695A 36684 bytes
SHA-256: 6412f4fa2f798185f86785328a86bfe355f33a283b996c0db693ef09ab06b5df
font_00_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD1 17548 bytes
SHA-256: c963992899f5e5cf710d3b05b9bd05390e17ab684adeac2b1f720b3f84908489
font_03_sfnt_off0001ab1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1D 10872 bytes
SHA-256: 9570f8a90fc808cdf5d4d03d81592816c837df25aa19ef8d5bb89c7f3a714677

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