Malicious PDF — malware analysis report

Static analysis result for SHA-256 0751e7798cc65638…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 08:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb089dfb1968024e5875dbb000b31876 SHA-1: f9407d6e84de255488bfc763c68463985f2cee4a SHA-256: 0751e7798cc6563891dfd87fba73f29a9541ec7c4305dbd20be75cca478e19c7
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hotelpenza58.ru/ckfinder/userfiles/files/zebiluliloxusodofid.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/p25run15ejaj3obash73b29dqo/losiropurudojufoboz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfeae53764---8408505277.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/77368842906.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/14173173805.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tvcnpul3tc6fi8uuq6toqht2dr/duforesajetimuwar.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2983b76f---fagogipuluxapezikutig.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/11817b380f80287dc14fd8184bb6a6fd/41347895466.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1579ae60e8bc257ad3cdb80d16e6c5b4/kafomazataju.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/94686867830.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/21598973069.pdfIn PDF document text
    • https://seikai.jp/free_images/files/xinawidez.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/eb08c23792d2944f7ef47b5165bfea08/vikonugakoda.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bumeriro.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b40d8a9dca---84148827618.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/39126648515.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95b196c3317c189221e5333e33eefd9e/76674386858.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9d6d1c2e2---94610318440.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/fabekitupemagelu.pdfIn PDF document text
    • https://maturana.cl/upload/file/domigakisilub.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c722aa550f---59291875597.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/5012878106.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/laseperajujepopelata.pdfIn PDF document text
    • http://ore-processing.ru/d/files/vimoxegikanubamagomavuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=do+re+mi+sound+of+music+piano+sheet+music+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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 17160 bytes
SHA-256: 381e7bba28aca8df5bf15068786ab8fcc13b1af87b3527d8942aea683b569aff
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 10940 bytes
SHA-256: 2ec94f98a57d38a5ba920e26e7e06fe0070d88fc5b12169d3e67737157d65532

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