Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85ff1beb38723fd…

MALICIOUS

PDF

95.9 KB Created: 2021-09-02 00:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e692c252739c90237876f186b744792f SHA-1: 58d6d1132d85caad36889e9c814727d81426c75a SHA-256: d85ff1beb38723fdb56f148d28e24354aae70f125827b19d4c9be370c9f05e21
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chingyi.tw/userfiles/files/48554446228.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5176f130bbc34a3bbba473e0e30deddb/dekogaredimufowojo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tulutufogodofezabuwamor.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wisokapakovatuk.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611847012bbcd---menekezanamumawirenute.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ff85irnogig4v0dceuepb5od6/29174609447.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/vexijagimanasojinedum.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/41890099554.pdfIn PDF document text
    • http://alkanboya.com/files/file///sabizapor.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xikeravorozuna.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/10322272367.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ocs00n9fvutejl52l2tr2oqd2v/pufupa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e905c9eef38---zumujejub.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/40957453573.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/9621779035.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/woxelaxa.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/88879672236.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e79e3dc0---xenibupavad.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/63868121088.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d98eeadf---22341548502.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/55910700796.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/roragejosu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e0469701d---kinukipad.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kiriwovebemeja.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/sumumujej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+ethical+decision+making+in+healthcarePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 17896 bytes
SHA-256: 483f3c6e56112535c0777850e4ee684b49c49d777e228192ea0e548bae8c266a
font_02_sfnt_off000157d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D2 10904 bytes
SHA-256: 3be8db0656d2f7f3908a052be4cc6ad8e963ff48b384e2db149045e4c22a2c5a

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