Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c71b5cebbcc6f6…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 16:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 100d4c4351c18d5b014322d59a320735 SHA-1: c9b95d925cfa112e160f4f558adc394eefe8d3f8 SHA-256: 95c71b5cebbcc6f6bc74959944401daff96ae9a09249dc3326560bc50c7d02a4
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1250b01e---gizilunotopipuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b822d15eba8---80293004540.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/249c417b208d2a2f0fffeeeada14eb6d/50578142639.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a155c2c2b28---67787224069.pdf
    • http://poiskvod.ru/images/file/21917123647.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24a3eed87---14639870855.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/nodamukiwak.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/21180456331.pdf
    • http://jarosi.hu/files/file/kewewewetawuwabid.pdf
    • http://cgl.lu/userfiles/files/tiwewav.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tauebc26jomqn022b90e9f9cm4/75328522997.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b252b692609---dixugabepenovumesodevo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1a742fdcc065ea9601130771ed489a96/69466182644.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5bsourfumnu4v139lisqu73b65/fijuvegubilenisa.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/42ol4q2r7qb8tqd03brj0khvho/26673577542.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099eadade4fb---92462378907.pdf
    • http://garmagostaran.com/Upload/file/gadulorawisiwozumeduredi.pdf
    • http://polyalpan.hu/_user/file/lowupizarizo.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d59168f28d69df5300c12f852b4cbfcc/zisutetomamizazovad.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/31ed63a58fca6dacb9ae07d4cbda4de8/fapakunisoganexax.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e8dd70e7b---ziwowob.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f1d2f743f90aadc990c4590c9de962d/wubake.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a31919dd---48396462715.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=thermodynamics+problems+with+answers
    • 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_off0000e5e8.bin
aa3eade15b5a9751312cfea172b5962665ef9a25f8c09e48349206247c5c1f83
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 17352 bytes
font_01_sfnt_off000113ab.bin
e4ab56c6c4da996f9c81f6f9e2f6a35b04f62839bf0fa6ed0a1f9e82903af5dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 11084 bytes
font_02_sfnt_off00012d2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 16792 bytes