Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc682685860a3ce…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 04:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaeb4c772d197a89c0b2a58c7544469e SHA-1: a8e37ce7d3fff95b38edbae93efc731acfe0fe6a SHA-256: cfc682685860a3cedd54e8ec8dc30e68a44eed0c34aebbf46dcabbf5577b0371
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting it is designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=roman+numerals+worksheet+with+answers
    • http://fandimnarodaku.cz/upload/file/gepukuga.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0e4904f8c86bc050f712e7a23b2d2045/niguzatedodovafagon.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/01554f6448a3d82ac9e57ae16551c0c5/25654784716.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/35f4e61e835c7cca26413f7fe0e04309/pegulon.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e24a282d1---fegigelonezak.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/01bdd7aeb589aeac487d7fdeb61a1dac/3151973920.pdf
    • http://ajivikafinance.com/userfiles/file/mowiwakisijitagepoma.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4fcbce242---11705101416.pdf
    • http://musicpark-live.de/userfiles/file/dumataxesasovupafenupi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711944bbdd---wigaxumuvos.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f7e2988a---tekutagave.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xugopodawefasukukixawe.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cag19lpckniplsv9nrnq4942i5/52047213588.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722ecb6a2c---16535682938.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a1e83ab6---62856037067.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bb4c2c4b---buzetiwutenamu.pdf
    • http://clubchic.lv/c/i/files/zipexuje.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4cf01b07---4071071524.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/95ff65c7bb675e8c8d0ad629ad3a4a7a/ralufodomupu.pdf
    • http://pallenberg-busreisen.de/uploads/files/52595840966.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842613c73---karotumadotunarafurenutu.pdf
    • https://zionapostolicministries.org/uploads/file/24688076851.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_off0000cd16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16792 bytes
font_01_sfnt_off0000e528.bin
de6bab44c2c8e39a78ee9be33d7bea7e78cf8cc0bae89bd509332622c21ac6a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 16980 bytes
font_02_sfnt_off0001119e.bin
44264899e09db1357bf525af957fcf3bb5db256b9551438d8d8b0baf49034902
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 10696 bytes