Malicious PDF — malware analysis report

Static analysis result for SHA-256 52896d48de23ad9e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 04:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a92067d2392b3372ab27ce7cfc2ad55a SHA-1: 6f87d05cdb912a1a5a1f8c70ec98fc1118279473 SHA-256: 52896d48de23ad9e20e1fd7bc95c3e5fb693c282d2f556393de8927999bcbd3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/huo9t5np6chdmomg8tcvt02t9c/56533721092.pdf In PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/maxamireduje.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160876de9868d1---24274083236.pdfIn PDF document text
    • http://klhl.com/userfiles/file/60744895461.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70f0458a5---danaxevobipokekodax.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/88d9dcf1a230fd2be93f2c6e2398cefd/zofowa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4cd8b8ced001f08f289b472f80b22932/jinajotifexerejefuxubupu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1a4ffa02bb8997dd8a5a94b13f32ae95/19371887240.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/jotepeken.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///63705613567.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/lurobezedifoxilud.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/75719429959.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/puxera.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/62214748628.pdfIn PDF document text
    • http://willbramephotography.com/1807390356.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/23691055931.pdfIn PDF document text
    • http://htygroup.com/upload/files/90574544967.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16118f37ea17b8---nixodoperisaxoreguxasado.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/39edd9acaf410092e2e2d98578940858/2597432118.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/37501434969.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/fusigimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pathfinder+rpg+gamemastery+guide+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 10996 bytes
SHA-256: 8b6442dca45818fcf2a88d23ac148d769f52839b0d2b66d66430cda60126a70e
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 18768 bytes
SHA-256: 369a167891ccd62ce3c6eafa18cf26ac61a2e2760d6ecf6986e8cbae9f9d97b7