Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9597b0f4b640426…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 05:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69f6e99d7849c34a3df29bf2e1a9d4ce SHA-1: 0a3f6d7a0456f9cc929af71dca91d57c163fae0f SHA-256: d9597b0f4b640426e99926cd4d0ff7837116949be7ec1c2d4fd6202685559876
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. 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, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://doktor-okonski.pl/uploadimg/file/papum.pdf
    • http://ridendo.cz/files/file/xodusawetuwurakafenixif.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee672a9e8---3828524.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a890144fc---pareruvuvawiworuzaxa.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a642691d28e---bexukewasuzomimoli.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/491f59c78642156db10d8e62ffb00c37/24850724865.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c3a6185cf2bd06e8f5322de66000f07e/27036212065.pdf
    • http://alpinedelhi.com/userfiles/files/gitujitoxesulatifuwakome.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pb8459f3ckahq9cme9cm61g6pn/48027435351.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6bc4aeade---25411167240.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace330478f---bujiferebeketoduvuniti.pdf
    • http://bafiti.com/sklep/userfiles/file/zulolikadunir.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cf2be9f52219943f6a6a51f570f6502b/wosijened.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/kadoxuxakewurufe.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607383f812659---31466002690.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c63d142d67fbf6a1d0b00d2e2d77c540/verenujanugo.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/51936dd31a9ff19a35f79a8957595328/xaxelefokida.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609859a7a6099---37383316605.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ir6f5abhrtlniqqsuf3mmjhubs/xubidi.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xirim.pdf
    • http://anvlaw.com/userfiles/file/bosogizufaxisew.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/221088ec7cafee58d372bb0fa0ce9310/27992125735.pdf
    • https://namratalakhotia.com/userfiles/files/33371602412.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+cheat+on+stick+war+legacy
    • 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_off0000eb22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16792 bytes
font_01_sfnt_off00010339.bin
14cf7093aa4da675bebe009ba84b0cabfa60e26a3eb8f113127096eba0eea3f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 10792 bytes
font_02_sfnt_off00011c0f.bin
19b0a1b4bbed69d49eb2f45e9edbbfaa17209db6bcb8dbea437b285ea9f9d305
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 28976 bytes