Malicious PDF — malware analysis report

Static analysis result for SHA-256 f441e228c8b0415c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 15:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baefd31a93b5653abc8b640734c5c416 SHA-1: 79fd7ab2990e3955f012246cf9149744974ea9f5 SHA-256: f441e228c8b0415cde27d7100d6df70c862835864ba423bba3252a0477d6171c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to deceive users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=breaking+news+live+malayalam+movie
    • http://artsar.pl/userfiles/file/xugijenanapuwasu.pdf
    • https://anandamsanyal.com/userfiles/file/balepenitujelogepulag.pdf
    • https://hotelgaric.com/upload/datoteke/3911962980.pdf
    • http://smepil.com/ckeditor/userfiles/files/20872765730.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc109b095---86686670210.pdf
    • https://mai-avto.ru/upload_files/file/91756076548.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402120c76ab---ditizekefetikad.pdf
    • https://mfdesign.hu/files/file/29943422528.pdf
    • http://hangnhatbanonline.com/upload/files/finewobekoxujapuku.pdf
    • https://asthasupermarket.com/userfiles/file/wuzejumazixe.pdf
    • https://ccskin.com/geektic/files/defiro.pdf
    • http://suurelepa.ee/data/file/98206331002.pdf
    • http://ferrocom-spb.ru/userfiles/files/gevakefadunopaja.pdf
    • http://e-baze.lv/images/site/file/bopekasekulanur.pdf
    • http://tuttotop.com/userfiles/files/87734955785.pdf
    • https://encoyun.com/calisma2/files/uploads/10662419847.pdf
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95333670420.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead1a1eeca---deruxukulok.pdf
    • https://bahispesinde.com/gnc/veri/_files/vimudiretomuvevipadobi.pdf
    • http://shanghaiqingchen.com/upload/files/rewimuligofifuvopimonu.pdf
    • http://kovofilm.cz/userfiles/file/34400716643.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_off0000c606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 16792 bytes
font_01_sfnt_off0000de1d.bin
f453980734f904fa9a3373f2beeb9c053ce2cd2bb3c2a955de733ace6bbc8d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10764 bytes
font_02_sfnt_off0000f6ed.bin
bba98c18a436a5875ec4ed1d892a37f581020a7124e94a962939ff4f27349981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 16552 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.