Malicious PDF — malware analysis report

Static analysis result for SHA-256 067e5b24cced4dc9…

MALICIOUS

PDF

135.9 KB Created: 2021-07-04 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e36d770034cead07457f293c823ff667 SHA-1: fed649f7d4ef221c02c1195d5d42478c062e1146 SHA-256: 067e5b24cced4dc91e5bc3f99111d1c5675b550ab48e2e2d264334214eeb930e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links point towards a tactic of luring users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9157

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://laborke.ru/uplcv?utm_term=another+word+for+entity PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c45c98535---29616001577.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c9ce72d4d17704de3f3cd36f750b02c3/11777920754.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f699748ff0---sakolejezevekaru.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210621162424257842.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d641590d310---zatubikav.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1134151504b2bea1cbaa18039149ba16/9821064566.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f389ad34648f42745e68e5bb120df030/zotafojitupupopedo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf508025bf4---mabobewato.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a482f470e4b---kawojewozususaxomo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kehrjsi784tf07ttio7gtap4h3/59495137579.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8nl0iii83h3i71r3ok6poh5qlp/76815859544.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e213b46b56---saligadakazaz.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/mowasukikumupuramafudebu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7f630587c0c229f6805283c78e5aa811/tokupisa.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/70827076163.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83352747515.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb3068198---toluraze.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fdakht6dqfekvlj61ujnfk7qc2/6010888026.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/nuwasite.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba413a979ab---83469497337.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da747d1a51---76532166560.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/70584143706.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9cc1b691bde25e49a41c60bba0757b00/bovawosetolizagurokevodev.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00015934.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15934 28644 bytes
SHA-256: 64bf01c6538f6abc51858bee4b15c541600d8a881fc2f8c0e1f69ed3a099c0ec
font_00_sfnt_off00014228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14228 10256 bytes
SHA-256: f233ff203fd49097fb9738f5b74c6308f2da9f9319064d03e017582c904afe3c
font_02_sfnt_off00018d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D51 32596 bytes
SHA-256: f84792b420829c51c6370b3e821347ce7c2bc3bf67717c3fbcac9de93088cbc6
font_03_sfnt_off0001d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D82A 9704 bytes
SHA-256: f95b2f26ba9b48b72b50c55219f29932f36d515ba9aa9e1d337f027c50f4a023
font_04_sfnt_off0001f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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