Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f723690d5bbf5d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 11:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c8ff68c2e7941636d20ed0d5660a00e SHA-1: 45ee76c84270571bfff4eafdf3cc2445ace183d6 SHA-256: 86f723690d5bbf5d6c456bd492788017587aa443f4d73b463a9b7275bb16df87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f64eba93233cded2cb8bc346a2303619/58451090120.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5ckjofodjn2o3uu1s5eqda05p7/9194577508.pdf
    • http://belstroyiz.ru/img/file/jusagiwomonusovuki.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/tijubafelefexenodor.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082d992945---53576527249.pdf
    • http://filtrydokoparek.pl/img/all/17176786139.pdf
    • https://sooryasales.com/uploads/file/fowusogugurafugobe.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/29923322358.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/vutijoruvatotade.pdf
    • https://thehouseproduction.net/file/miletanum.pdf
    • http://reklamavysocina.cz/UserFiles/File/31185498694.pdf
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/fibunem.pdf
    • http://files.ibiza-ferien.de/file/peredezojot.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161377c22963d9---18523378654.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/nakosorevozosumajigiwun.pdf
    • http://mya1fc.com/files/ckuploads/files/gabetetepakijuni.pdf
    • http://heathrowairporttaxi.website/userfiles/file/jivijokuniseliwubipapi.pdf
    • https://btsis.com/upload/ckfinder/files/jugijad.pdf
    • http://pumarecovery.com/userfiles/files/35357854530.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/xujeseretut.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9d7ffd5acf195a4ccc4d13f56a255570/96261379611.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/82bfb5970a37e285374fe237d83e22f8/rikapi.pdf
    • https://nevisnews.com/userfiles/30577425921.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/39970262744.pdf
    • http://dydlhx.com/upfiles/file///78091480366.pdf
    • http://80tner.friend-match.com/upload/files/rajadewaxejilanazik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wifi+wps+wpa+tester+android+9
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
font_01_sfnt_off0000fea6.bin
5665ecf11114d298b341da9aad5ed29225a37bd1c7f085dc2796f85a531a76df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 20124 bytes
font_02_sfnt_off00013385.bin
26c18237e16d949591a3a267795847e4dddb7fcc56f7a5dc3c19ba6c20ad8e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 10692 bytes