Malicious PDF — malware analysis report

Static analysis result for SHA-256 375706e0c2975960…

MALICIOUS

PDF

111.9 KB Created: 2021-07-31 02:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf79c7ad7531aadfa76ab6412d561794 SHA-1: 98e7854b792e973ff59dd8b994629d981bf3185a SHA-256: 375706e0c2975960d41964785a4f8c198bcee4b08ee8707cc4d48a3c255f7910
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, specifically utilizing the formcraft plugin's upload functionality. These links are likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a978064beb7---vowovutavilifit.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee8ad9b27---40449260036.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00uuptppq4o97hioidm6j2v1br/35764224934.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608391a92e122---2772937400.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/450c15ea5a1cc750147cce7a93be9873/20656155119.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/14f5a62e0f38e4bd599321a2eaa20ba9/lutogegitavixafowekuxolu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xababamenapedenawevumew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eea4703c2---78200567558.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6caef2776e---13917484609.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e4375b1d---tuxivokozomibosamugaju.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/18092175061.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ela3bohqj8b2c988ukj5i4bi53/xelus.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/44ae298736ed7bf769433f0fbf5bf031/34641726476.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0ba4a2cd873b79a758cda68924efc0f2/pamimuzujaxejibafo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889a687a6f5---69569914918.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v48in0umdfodj87jm80fl4dt6/tukatibeveposuropabe.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/xaviremosapomulavoditoki.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160f95778e8801---53265188478.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf1e122093---xujegojonolazudutodipal.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161046b069b360---ralazudisimiru.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3a1e43fd1---ruvotolatinesivofelapizal.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zalarizujanunafotekijiga.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/mexejigefivatasopogelisa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5f06a2da---jonoxibijalivekit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=brocade+fabric+os+command+reference+8.2.0PDF 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_off00014de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE2 11200 bytes
SHA-256: 271fd5fda021e40f51dbc9e7e309623b7992ed228de9dcc27e5fb58f6517a29b
font_01_sfnt_off00016818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16818 17832 bytes
SHA-256: 9d7bf5e8ee6f15e309488bc464161d69ed3cc7105fe384de1a87546662ddf6fb
font_02_sfnt_off000196da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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