Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a59316a9413667…

MALICIOUS

PDF

124.7 KB Created: 2021-07-02 07:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ae1ddbea1c6d88b12754f34c7670315 SHA-1: 4ebb018d81cf6e084d3c45e6381dfca055addda4 SHA-256: 00a59316a941366773391a00ebe61c62874070ce1ba9276f0ff270b2773c87ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing attempts or to download further malicious payloads. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=system+identification+toolbox+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607235c2b9c36---javuzuwininuzorife.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/86816447089.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/zujebovabezekekuvazan.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/1fd3c0356f529e9793c526ebf0e93d78/50813727888.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/af1f5d32921ebf2a0032c795d78e65af/xomufoxorenaretoxolo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/868f0ec1c2e11a80437305a13765d1ab/veveretasejuwapifasufugu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/demewimomiwufixekoluxad.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c1b4406e08501630a563a78393626ad6/27284920300.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b369c49b7d0126ea48caf7bf9075b393/15524838316.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/k696v6futvasejpe9tm048t5t0/20441369479.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/86122573012.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be7903d7cad---92559867138.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086486417feb---11042930611.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ca487a45984---29386576909.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/tamodutodijatav.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a008d1ed464---96401832442.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb080d0c95---19023756757.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/41595648137.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xabiraxasimidaduwog.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/najuvejobifosobuda.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xavafofasunorabi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608895b269be4---69401899280.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/36517700766.pdfIn PDF document text
    • 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_off00018375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18375 18272 bytes
SHA-256: b68cffe387b59e62c3cd40ede1ab125abc32f165ebca30d034b4b22ee1805734
font_01_sfnt_off0001b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB66 11112 bytes
SHA-256: ec4279119a9ae57566ea3155b88aa233f0ecd8072fab5a1bf355e6022a665b5c

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