Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78bbf7a82376ebc…

MALICIOUS

PDF

77.2 KB Created: 2021-06-09 07:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a71c2b4d1d2801dd7f24ac5854d9826c SHA-1: bc11f99bbb0b32a02abe1a1c4d6bc0f166967d6c SHA-256: b78bbf7a82376ebc23b9d2864c979d466d4f08a9005623052ee08e650696738d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to trick users into downloading unwanted software or visiting malicious sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=pokemon+go+unlimited+pokeballs+mod+apk
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609877bc7f8c3---kavexoxupedap.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3e2d6854---segilemikesokuwaxu.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/56ac5e92515ec6ab4270a4c7e2195138/bixuzazibexubukuradojojiv.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e86da20b1a69e10e699ad1d1d33cf158/46382834442.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe34bd45c3---92161937299.pdf
    • https://299-45.com/CKEdit/upload/files/36738596836.pdf
    • http://rotang.net/userfiles/file/kupex.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/gelobap.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94cd20233d---62012046519.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2417ddcb48---jokotijefodiwitudala.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/dd477b71244683cb0403f74e1c682912/8949845484.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d97354fcf---junikapoxoropimak.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b212772289d---99999606290.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3bca7aade---88699551225.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ec4022b3---dosagexazeruvuzosaxule.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/20749e01e7d76bfcad2dc2f915e9e0ee/forem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edda.bin
c6170de2ec9f35cd431a75e1c6002712730709c080f5746703f8b9f79208ce9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5388 bytes
font_01_sfnt_off0001001d.bin
309f87b63829fb97b0f329747d9a249965f78b8d1a7d58c2db048d901b165bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 12036 bytes

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