Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d08e22eff84d91…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 08:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2edae3de3f1847eef55d13c1002b28ce SHA-1: 25396d6f4161457a7473662d9909e766a240fcd0 SHA-256: 36d08e22eff84d91f8537ec28a67fd8b41f7ee0fcadb3adce4e0c026598d4ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of numerous links to potentially compromised domains is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://parc-hotel.info/file/labuje.pdf In PDF document text
    • http://slovbau.sk/test/userfiles/file/84964753868.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/9718286608.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbbf63a6f---88343404796.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/5739306192.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e1b305f490508fb33fcd6b8e92343216/bumib.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/51mku3l8cbrmrbuof6hmtlimbl/suripobuzadepitos.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/94895085674.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/83891476745.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc81bf252---xafufifexa.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/dea105b661226f95e12239487c67e52b/guresowexoni.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/bogepubujirataxipiduki.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaff16cbc---87994374542.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b55hepmlquavpoh6hj04t515h3/23267363191.pdfIn PDF document text
    • http://rotang.net/userfiles/file/jejodom.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c10ca490683cf838e8ab9cb62d117154/sobogabaxov.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081813e29957---funavuji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4tc2rqab069cmjeki50dj71jm1/mezex.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2cb66c77dcff91a6ac2590d335494530/buforobitebobibajiv.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/93167634036.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/fepikud.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/43765408564.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608b488014374---312352066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=practice+occupational+health+and+safety+procedures+pdfPDF link annotation
    • 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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 10932 bytes
SHA-256: 249f6483edb82a2addaa0b7389a55eb6b697f59b8f68557aca0ef65d704ed22f
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 19232 bytes
SHA-256: f3c2eabca77c8abb1fb3045ec60d6695f345d028084778d3d19755f940eb7933

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