Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f566308532821f…

MALICIOUS

PDF

104.8 KB Created: 2021-09-04 22:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cf5291ee6f0f24039edf7789b227206 SHA-1: 13c824853b0f4c8f2f01ce136571602101538f5c SHA-256: 29f566308532821f7b487ac87b538aa5e732f86991c4e2ee77276087f4f2e3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF's structure and embedded links indicate it is designed to redirect users to potentially malicious external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://irlanc.ru/uplcv?utm_term=throne+of+glass+pdforigin PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ff4a4dcb---nujuvanad.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160833af49354a---69359721504.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a468205ef9f---39992144852.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/vobeworipapivabikibozajo.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/99425718741.pdfIn PDF document text
    • https://efnnma.org/files/file/kijadasolitoturemuwibu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tnehsbjgva6et2rf9mvtharmf5/rogikuzujex.pdfIn PDF document text
    • http://kezmosas.hu/files/file/36027711348.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xigefikoxofifu.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/31817945526.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078382763819---13134631084.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8a4006637fd25acecff3cfee3e6f278e/86290536139.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/rinugefananutozatusa.pdfIn PDF document text
    • http://rcot.by/pics/files/26561047547.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/zowulalarurokenalidu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6dc1c8d60aeb0b1bac8a8960c6254046/4134773640.pdfIn PDF document text
    • https://jobtiara.com/files/files/jinobopoloxewaxunuxe.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcaf215cff---lozosoba.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/jofekotabejuligerojexeva.pdfIn PDF document text
    • https://tmtteks.com/files/32687870918.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/45673501690.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/47515252532.pdfIn PDF document text
    • https://inifd.london/uploads/file/67280580165.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/pikulirevemegokexa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d147cc7b43a34baaa92abc5b69621373/lafalafivifavudesuz.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/munoko.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_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 19824 bytes
SHA-256: 0cb6ae877d6a4ae1d593fc43dd3757e985388254ecf204578f716202d2ff3188
font_01_sfnt_off0001653b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653B 10644 bytes
SHA-256: 25b6b8538128db9bed328725bdd1db2263f0b9169b7e08ab4e1df99d18ddbd47
font_02_sfnt_off00017d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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