Malicious PDF — malware analysis report

Static analysis result for SHA-256 27736f13ed8f9301…

MALICIOUS

PDF

107.3 KB Created: 2021-06-25 12:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3bd1c32294f9baa3ee0f6b5c464291dd SHA-1: 36c80869221341a41119c7d86df61fe06b28c20c SHA-256: 27736f13ed8f9301a5a7c3a4ba1604c04fbd18e280920910b702a3d320bae820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=lcm+of+16+20+and+24 PDF link annotation
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9ef29726323c19e507592892325e920b/luxitaxog.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593d86ac82---fexesov.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f663a2d5---73543603333.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/9705378137.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/67fh3u1sq420fo69nahmhhfhl2/lizobolat.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/72101507941.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vomexitetunolewalale.pdfIn PDF document text
    • https://fallsplat.se/file/86614833417.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/9102964430.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986df5c7b22---61612580157.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/2ac1678e60250b5f59ea573ac598de1a/jafuriferagofugezo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/rrdv31ka90cqbmn0knfrfo21b1/53446058880.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/706486bda1d55f00ea73eb8ffb93767c/zufabuza.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/902b8ddf4b44706908bb06c8fcd0578b/66024089814.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/85185826181.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/crgbdhmq6og3gkga1cks1cifbn/bogamab.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ce28e1b983f98d68df491e4cd059f09b/77128628324.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090bafe80dd5---49943877101.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 10496 bytes
SHA-256: c013f2c963bdbba79762dc06fa2ad4b3c1eef2fc85916195a6ee5bb24ab4b65b
font_02_sfnt_off00015874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15874 18872 bytes
SHA-256: 92b48ca26f7a406e56485b2024e141f6361b59ea98feff5739799adcaf32790a
font_03_sfnt_off00018adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADF 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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