Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc644b074d0aae29…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 04:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec3815c1648b0aa156e2daffa63e7904 SHA-1: 3556276afde74c5224305b7385d733baea14b8a9 SHA-256: cc644b074d0aae29913a6a36b15a2ae3e020c9f7bf597a46fb30742afba5de3d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates a link to a compromised WordPress upload, suggesting an attempt to distribute malicious files or manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://eingangrad.ch/userfiles/files/44144347967.pdf In PDF document text
    • https://shopabrang.com/images/files/gezovuzobopurabab.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kokivobazoniwijekusad.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/mafelabidori.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/6002011711.pdfIn PDF document text
    • http://riversedgefm.com/files/file/85184302293.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/36997819929.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ade9a67de09afb0d901377f2324a8260/20760517395.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/24922014955.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad510a19f---32198953779.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/84593315906.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/46854804429.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a78d14fa---14916020620.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/53558069086.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/bizenomubidugubanixapuw.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/1059081507.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/22894713762.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/35204165436.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/7441308235.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2e1c05a198ab137e223b20fbb7ce9455/tumivuvutozuzos.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9345de14---gezekit.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a458aabf---sonox.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd86f90134---84372260515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=class+11th+some+basic+concepts+of+chemistry+notesPDF 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
stream_004_off0000e6f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6F9 18904 bytes
SHA-256: 1ff46cd925ab8ff83bbfe05deae38db3caf83677815891860423d28ecd7ea1d0
font_00_sfnt_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 11084 bytes
SHA-256: 1798db543c12b1e419ccf4fbbdb1ba395b4642d9821c2ed5e949b42f9036ec0e
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 17036 bytes
SHA-256: 553295342838165f6fd885e2db85fe9a3681d7ef6b0c06bae3d308f52621804f