Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed3e2d5aafa304f…

MALICIOUS

PDF

94.9 KB Created: 2021-07-14 04:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45d03d87477ffbea70176cb993cdca01 SHA-1: cbddc9fd061f108fb1b48b717ff2d9dce6da8f0f SHA-256: bed3e2d5aafa304fd5b171c3487285d860dc00ef8976881232a723afa9d96727
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=just+cakes+bakery
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa7541757---99941353021.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/poxokurigupigogivala.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5f0767dd3d3e1807ebe9455cbb75afca/17945481369.pdf
    • http://goldnumber.info/userfiles/file/nosaxogejimetezu.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/48707809431.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce67357ac---mukunogoze.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4128f1ebebf0c639e9a3de5652cf768c/24703421601.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/94et6uvb2h71dfefjprh8b5ku5/67621233162.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/601e85adc8c1ef14bf59883077341003/nadosokosilimig.pdf
    • http://dgjst.com/upfile/file/vojefujoboba.pdf
    • http://activesolutionelectric.com/images/file/getepi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e8a2c6e1---lajazekufunigalovuw.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c1ea04009---firimifew.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc63952b0e---zibigox.pdf
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/vunejuroresigumemilumazo.pdf
    • http://smartvoicecom.com/userfiles/winowatozinokivuviwagek.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5ce5c04c0858514f4e1d207787f160d6/80837352204.pdf
    • http://akinmedikal.com/uploads/file/70975295810.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cba16179141---budiwudonuxuwid.pdf
    • http://meble-tk.pl/userfiles/file/dixuxevo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f242.bin
d938e53ffa5cde0ee0de0cef66594a50134d505aed57528135c3de8ba9b64cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 18060 bytes
font_01_sfnt_off000120ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 16792 bytes
font_02_sfnt_off000138fb.bin
7a23d3717d014423acd86c7044ee03f49be0eea5ae318fd78b6b991ee371fa10
pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 18656 bytes
font_03_sfnt_off00015709.bin
158f936f48565afc4e31fad76bb6fa8bad9d9d8f8a17c07916805fa06dae85be
pdf-font-stream PDF embedded font (sfnt) at offset 0x15709 10296 bytes