Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87a6a741782776f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-14 03:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e9e27d875fc553d87817ba8c5cdb953 SHA-1: 3e0236a2fbb9231871d48628165667a81f72ca71 SHA-256: b87a6a741782776f59b07943ff7fcd1e8015ea076e75061f6315e5c03b743a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to exploit vulnerabilities or lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sanruouvang.net/images/uploaded/file/tibolivakiweja.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160814f4677faa---sumetejujokawagedizo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fjuqebnt34r7voc1ptludh6rj9/torozezelazeloli.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1486fce2c3---tufaz.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rguh66kg6m6ve4i3n7mmj46sll/17936344277.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768330d815---tamepujediw.pdf
    • https://suma.ca/upload/editor/file/6703802491.pdf
    • http://ehomeforeclosure.org/images/file/bozuzomikesozubilumumami.pdf
    • https://daulte.ch/ckfinder/userfiles/files/fowawesofalulegesiwekigin.pdf
    • http://stroisvias.ru/userfiles/file/buxujas.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b833d4d5a60---nanusijasafexom.pdf
    • http://eltonltd.ru/sites/default/files/uploads/12481113472.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb97bdba14---9331307646.pdf
    • http://hrudolf.com/userfiles/difexafikupuxaxapiketola.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c7c0783b---legexivetawojepizebij.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/2573415621.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6a648e5df1f756e8fd4ed6628270aeaf/45000366054.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/459be2724e121d2b5d6c6c5333b4d98e/ziwegozitixe.pdf
    • https://ms01bet.com/contents//files/karufusesemotupobadaromu.pdf
    • https://ewastexperts.com/userfiles/files/16327669169.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b222d5d1b1---21166868172.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4ab6d02e615d936e49091345f68d05b6/paxawetegifizadokejojuko.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b4676516a0c5a851a6503eb8dc17dbb2/73456833095.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661bbc3d17---noberaliru.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/16831591769.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=complete+the+third+person+singular
    • 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_off0000e637.bin
09f62b178970a3d9d3516157a475722139786baac3bd49a9a5b1eb23273eea31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 18180 bytes
font_01_sfnt_off0001158e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 16792 bytes
font_02_sfnt_off00012da5.bin
d2bff3246d7efd47d07af2bdb125b5c0d3450319df0e8dbc45d9e52ad18808a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 10972 bytes