Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc3e2e71f673936…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 18:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e512c8b0c90a3eaba91a851e1b14ded SHA-1: b59a19a0bbba5eb4db7b667278570bf0abea1497 SHA-256: 7bc3e2e71f6739361e7d298c6016df2c2952ed3e352ba64ab43ff866d747fba3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://sirmamedia.com/ckfinder/userfiles/files/7633461072.pdf In PDF document text
    • http://dgjst.com/upfile/file/zuvowakevofovixodubumizu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa984e6531---rapobogek.pdfIn PDF document text
    • http://dentali.cz/files/files/begabatefixefigam.pdfIn PDF document text
    • http://zerosquareonline.com/file/64230713086.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tewozodatonuwotagusugive.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/45696599393.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/96283460522.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c69e51717---jexukapopowasiwebulafet.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/46699401558.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210630_033437.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/rowipineraden.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/20945087136.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/42965cb4a2af950724df9a1c083821bc/96809913858.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/dokasegederigedipidi.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4o4e14bu6167baeu768u6rnacb/kudotilaxepuronunuv.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/62046112839.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0gkhc9lpeklt64q7vfcrhm7ge1/26857800482.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/eicc7fjpo4uuta5b21bq255pq1/4506067091.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/25447077131.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ks40221kbv2ntk5uqgn39aivj1/zarapovob.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9628a3fbb---lijilolusatunenudibogebir.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/26m28r2kc67p39s4q8cpsvbl57/bojarolavapumomiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=canciones+de+vicente+fernandez+para+descargar+en+celularPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 17500 bytes
SHA-256: dbcbbf2d41fbed0d799d7c57b16cee222e0b250c60d57ed99d54d6fd8cef7bf2
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 11052 bytes
SHA-256: dd818f8bf88716f8f2f7d0cf3165c24cc8703151bbba16642ac9770c55e6a922
font_02_sfnt_off00012b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1F 17004 bytes
SHA-256: 1d6a7c9b1d4d910ef2546efc64e1e13bdf32658182e4648c55faf23d02ed6acb
font_03_sfnt_off000142d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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