Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f658236523a7e3…

MALICIOUS

PDF

86.3 KB Created: 2021-07-09 06:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 591837f29c3efe983c2e65914c2a6a96 SHA-1: 48b39b2652f225526923cf77330eef18f237c081 SHA-256: b8f658236523a7e31aabcd04e6a272dde8cb4e7fd3bc7b944af9a238406a3968
144 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a visual download button further supports a lure-based attack pattern. While no scripts were explicitly extracted, the ML classifier and link farm heuristics strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=least+squares+regression+line+excel+template PDF link annotation
    • http://granite1962.com/clients/869125/File/jamogusele.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91539acec---saziz.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/zigikanaf.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/binulumepewamirakapak.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce11e1d668---zowuxuwufolaka.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/wisafe.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/xorubaripazurawapobon.pdfIn PDF document text
    • http://simonide.org/userfiles/file/68630907571.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/waruriwixowisopez.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/buposunuvudaxadiluduw.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ef5a0a0374d1e834cae5dd996695ea6e/24960597004.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5hkjovvpd1rejq6v01mkch6j8d/xosanavajefox.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1998bc9d---42930026017.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/58464365898.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0b7bd9b3e7068a074287bb9804d9c0bb/wiwogo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efb5b6a1e---6325007624.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/734e22f8a89f456c7ec89555d0a5a862/39025999279.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/64165650077.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/agga9gmbkavh6pg6ls235rj387/jodirixaxivafezedevir.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1otljjhgr27k4125gecfi4rhe6/1963272466.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d1a28314---koladepojomapamijexos.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/sijafuxumixakafagiwagitu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e340a230---99381106488.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/52878771688.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f051c01e1---lirusubizusib.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 11020 bytes
SHA-256: 7992563efa8db1101a6b464ff330d5a46c60688a9d4317b190ccb0cd1d026160
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 17240 bytes
SHA-256: d1c1971a91b431606f61be0fd742f8a00bc8ef225728230dc1f5dbc4c91847ff
font_02_sfnt_off000133b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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