Malicious PDF — malware analysis report

Static analysis result for SHA-256 110d64091307a339…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15a6d42e1f5d944cc5cf63f08fc3f97d SHA-1: 968d58762f3fd3453663a9317d1a63b4dc422784 SHA-256: 110d64091307a33945655b87c78ec76e2e8a0db993b0e47837a8398921ce4e19
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://altbuket.ru/files/matipulamunujepuvopuwa.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/44vo04sf9fcji4vqv0ae4tm4b2/disifexif.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/zegazukegiselofa.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e858b4ad---favipozu.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/sifedajogorimubewikedije.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/25489374885.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jibegofiw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mp6igqpata7jjo58ou6to5i9p5/fitame.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3390ca9d8---rulekofemabo.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zusubuwaroves.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0bfac9682---puxonogolewu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/12f5b76d24008e5d66ea2ecf67ba0998/402229178.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3r9gm27ues264u2pgprrckjlh0/zodanafonire.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24dc53bc9---pivariromuzipoz.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/140b58bd64974ea1e9df63c5624c9206/13790672133.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/14396556948.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510435397495.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/polevepatep.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9b5ad45ac---22965706166.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45bc3995c---vawevefovanuxam.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0477bbf26---76714849187.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/rmh1jn8q73oiffqrtqjiac8k22/nosufaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=my+stomach+hurts+to+touchPDF 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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16844 bytes
SHA-256: 60fa5de91a14addc967b88bf521688f7eb9777fa32b82390f8c88e4cee9b9711
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 10328 bytes
SHA-256: ae19095b450946e95d17678c96f6f8e6b6e1a2e35bdf5da29b5599bcc92d28d6

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