Malicious PDF — malware analysis report

Static analysis result for SHA-256 78594e7d53f088e1…

MALICIOUS

PDF

90.1 KB Created: 2021-06-14 22:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6dae8695fc6fe16e667ce11a0b2cbfdc SHA-1: d3fe7909eff18f0afa899cf959968aeddcc61b73 SHA-256: 78594e7d53f088e1c27b939f553ac75d909f2944dae7b4a6697a6d2ce9bd38ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=timepass+tamil+magazine+free+download PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ef0f9871c---76608941977.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hpceugt73fl1aq6rc73oqqldcf/lodadupomufuwirunukajeda.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9e2e5007---7152365146.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/1m5bn95ce5j7j1825s1bkndg3p/dixapobikanilike.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa3d94d1e---boramekidulunomobat.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217f9d0579---gavobisikete.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/94747965644.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/tunosolajazimupiwas.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s5e78rp3d9i1966nntcau6s8t5/lanavivosanegibos.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wokezabozavirofob.pdfIn PDF document text
    • http://elitvorota.ru/f/file/mokemu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/28403396173.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af5cc9c02---64984874596.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/30539634154.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f12121aad502546e88ea8f2c8243dfb/kosinarawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 5240 bytes
SHA-256: e96f21ab04c0c5d9f20b059224ca0fb12e935e3cee3939b5b7cb013171dac411
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 3796 bytes
SHA-256: 04c9d33f303a0d72b9db91f829f8bc810f153d7e70181a50b82b2c91c29ecc72
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 11656 bytes
SHA-256: 0411e3e099bed7826d793b7f136aece95861cba7c3b28f37e87e53dc1e644491
font_03_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_04_sfnt_off00014c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C08 3648 bytes
SHA-256: e013199da6bad89435e2e63bcb6408a3e2ae266b4d227aa1d192419caa7d7948

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