Malicious PDF — malware analysis report

Static analysis result for SHA-256 842a552b02cb921a…

MALICIOUS

PDF

97.3 KB Created: 2021-09-04 04:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fed95f089882585d6db5ccc262d78f99 SHA-1: 2529fcc5c6714240756777b1b2a93a4200e6ab70 SHA-256: 842a552b02cb921a5a3c37a664f25567b754409f0560fab9a06ee195f18d54a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, suggesting it's used to redirect users to malicious content or phishing pages. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports its role in delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://wastran.ru/uplcv?utm_term=blackroll+booster+manual
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/144786e378c3b1273bbb255b36f4ef22/67163221621.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8cc2b7e2308b7eeb784fd28f2bfa9b36/vefapotipejatuzibupi.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b98501b23---53480212005.pdf
    • http://zafirkort.com/uploads/files/baluwatavemegabesalanob.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cc15b712cb76a0d5fa07efb5fc75dc2e/kudivizejitosowilebedi.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf17f3c076a---tevujiwuvopizuzuj.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c93132c9f81---zapenibivegexonoladiled.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccab8894cee---14910104332.pdf
    • http://centroolosprato.it/userfiles/files/suluxaw.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/sh6mr87kpgngn1qgplqmmrd53q/68170578255.pdf
    • http://jiehuist.com/userfiles/files/90517884030.pdf
    • https://mobspace.xyz/web/img/podborky/files/35180312071.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a3b8e5cfa3242bf60e959b14850b7e06/8123987352.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dropslues3n1f721nvdu5a09r2/89769608688.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/52942158785.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607093330b7fb---ripogalejowik.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f728e7b9b0---xorogoxegizoro.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d9aadd45251---sevobipekol.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081888503b97---diloxefoj.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b254571e---vugipisegomerowamiwotaxo.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9889fc2a---82726413357.pdf
    • http://abbuffalowings.com/uploads/files/tuvagujefatuwajig.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc8d84dc8---79335827268.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/26809648471.pdf
    • http://orchid-daikanyama.com/userfiles/file/minopawotalej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ff.bin
b32caed9d11c74bf5b4c6512ee8454eb97617b3e72dc951d6cdc6b3f990b43f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 20012 bytes
font_01_sfnt_off00012ac6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 16792 bytes
font_02_sfnt_off000142d7.bin
eb9217f0c6a105c0a7856642ac6d3aa948512f24780f8a4552758a86d80dd62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D7 17664 bytes
font_03_sfnt_off00015e5c.bin
75a1c4806ac58065ebf14d10c181dd75945f76ecbd42a13440f4c5953b0a4790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5C 10684 bytes

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