Malicious PDF — malware analysis report

Static analysis result for SHA-256 5794c348c73d01a6…

MALICIOUS

PDF

80.9 KB Created: 2021-08-16 01:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 62a58f9ed9b760b2433291f75dbb1ab4 SHA-1: d5a3640b076b899da75d819ae6350ada0d8d71a4 SHA-256: 5794c348c73d01a6efd5d4850e4bc252e3d93f50e949e607acb9a4879ce6362e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious content, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://notariocprietoa.com/notaria/documentos/files/66169769614.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2c3d1b64---nunasidaxaziv.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/nanimusogut.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210604232557_9m0e8c.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/43876535430.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/95273347696.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1ee735e72354572dee5bc629a6bb7dba/tinajukovuzipe.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/p87avs11jl5aq2dho4hk80e7bstdnrcr/livezarorotejomiliga.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e5cb64cc8---73479718135.pdfIn PDF document text
    • http://klinok-saintp.ru/files/54890039850.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/c5588513db5113cbcb33f3d7ebc15ffc.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/61135783240.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5c1ade7e8824e67fff5eff5544a53656/42464493429.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f82a0430eb4c1a11d4181454dcbfe583/29088775192.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191a9c73cdc---59373568713.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/14308722744.pdfIn PDF document text
    • http://vo23.ru/upload/file/51061946095.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075991b393f5---zasewaro.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077778c485ec---zamelutosaxanibigibatakir.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f13f9bba4---54391110153.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150d81b1874---92176134607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=exercices+g%C3%A9om%C3%A9trie+droites+parall%C3%A8les+et+perpendiculaires+cm1PDF 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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 18432 bytes
SHA-256: 2e582c69e5677467d8d42d4e75bf6a632c3272375db4112c556843f7127949dc
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 11404 bytes
SHA-256: 5c57c852982b39f2af24bf8725e2ac4ef65bbff1cf722f719f43ac90f491be9e

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