Malicious PDF — malware analysis report

Static analysis result for SHA-256 3931b1b83d557981…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 00:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14b285ece3c907888c22914e2373841e SHA-1: 323ca33508bd148d8d118ef6e24490d8e5bc71ab SHA-256: 3931b1b83d55798141fb767bfbcc8773869d59fb862dc2f6087c0c206656cd27
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress uploads and algorithmically generated URLs, suggesting a phishing or malware distribution lure. The PDF structure itself is likely exploited to redirect users to these external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 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 http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/lezulonaj.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c6e4b2e5dc99ab3fe6c812bc34d057fe/gusezaruzosaroz.pdfIn PDF document text
    • http://zae.me/datafiles/file/42563144467.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210613085133.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/12942f1950e5f9ce039b85b0c1c20ba1/31708030594.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/866efaab6df98c6769608bb5f7fe2222/gagugeropo.pdfIn PDF document text
    • http://rinsacars.com/files/others/27459427710.pdfIn PDF document text
    • https://sanidom.pl/img/file/lexakidirebufobofe.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/939a604c14e094736ebbec2b78054e31/24320385938.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/momo83gfkt7gq6e63q85ncia1q/radafatese.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/bipelafizitu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/budanewu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/91c18d82a341d7d142e03f9ac1923000/soralaraza.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/22609179511.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/80453489399.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85a071f92---xojuzib.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/saninuxirofupuwefev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7412851c---sojebijokajogu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befe4d0bbe6---80991650862.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/17565354223.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e56815f88c---81298654316.pdfIn PDF document text
    • http://budka39.ru/files/rururalafitusufewodux.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tediruronefonidevowawimal.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/327b5ba823a7c79f30665ba6e477e75e/luwulotit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pradhan+mantri+awas+yojana+form+pdf+lic+housing+financePDF 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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 11496 bytes
SHA-256: 5d74c042ebb59e409c8d733aac281b49823036884d2c658a6155c3a63f18b2ae
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 17336 bytes
SHA-256: 433203f67d57e9e1b799e9c5f9f5240e74644bbfbbf203e39c0730feae81bb1a
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1