Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e88f32401eb3ed1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 15:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 65c319adcf7e99f248c49e29fca6794f SHA-1: e23b08308296b960c9aa0b1a40c2689cf3879206 SHA-256: 5e88f32401eb3ed1629b104928eac4064ac9f1efa898134d5c876b9659e66013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=coats+40+40a+tire+machine+manual PDF link annotation
    • http://digitalpolicycouncil.com/imagenes/file/90837488664.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/233d5efa99b0a70387f9e465b74a55c1/zepixisimoxiguzulofub.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/13348908261.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/22851058925.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60366337c---vodabajaxusarujila.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/1692583611.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9dc891f62196e6ec269f7654caceab7e/minetawutaduriruv.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/01bdf6e5afb1d08e7dff7c6ef00e9810/tatukowefomi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/39c0f9915db03ce4f35db0d22b21fdce/78484889039.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0fb3cda4e---pasesu.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/nuxamuwevaxifaj.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fitun.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765a0419899---xulebe.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/81798939441.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/jutelalameza.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0321d27232---berijixiwarapovajinu.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/11360600215.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/45038210399.pdfIn PDF document text
    • http://abc-tel.ru/data/File/40905537250.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/betojaneledeneruj.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jisokivisetuwunametir.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ns1ugk815jf79cmiqnhr05v27/69881367237.pdfIn PDF document text
    • http://kechengchem.com/upload/files/nasulipiragomi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b0f8ab429---44327343454.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 10828 bytes
SHA-256: 197375a704a3bb2c11098f63e44797ae96e418fc86724592b0eaa347c9e4a26a
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 18600 bytes
SHA-256: c53ffa356038443e48fc45f57abf8fcfbb71f47ae1369dba4face24f035f8ad2
font_02_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1