Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bff797f866a4111…

MALICIOUS

PDF

90.7 KB Created: 2021-08-11 02:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4436a547de09c7b77d646d98d8a07da SHA-1: 403be762398be40375762d1aaccbbd9f358925bc SHA-256: 2bff797f866a41117e15a1974548d049c259f579174895a6a00582679cfc574e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mn-print.ru/ckfinder/userfiles/files/92076811422.pdf
    • http://tmtechvn.com/webroot/img/files/76956499474.pdf
    • https://sportnazona.bg/f/uploads/files/dukafasikuv.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab44ce046---30952237058.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092dccabeda2---10274691833.pdf
    • http://p-energo.ru/content/file/8304783820.pdf
    • http://www.alfapilates.pl/upload/file/49620071245.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763fb1b1fe8---8321440042.pdf
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdf
    • http://studiotecnicoforace.eu/userfiles/files/folojofugofe.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bde9cb94a---30955834876.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if7plrjt062sq7tmlgp4pftu6f/kixitetewivulakojojamima.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6a0e628c887b46a6dae16fb1b259d228/20299779434.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/44830062933.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/213d138b16d15f317fb6d4ccd5638be6/dusadumutonekavus.pdf
    • https://mamo-tato.ro/userfiles/file/61512136415.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210603_C3DD94FB978C94CE.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3dfb4cd9---84562720698.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c1ed425e---66318369660.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/fawepo.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lkmf2ubnolftih54bpe1102or6/7620105196.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/38b664d55ed9b1326cb486d8bf212c39/gowuwitoxok.pdf
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/maguwukukanul.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d44143358---20468961137.pdf
    • http://slmj8.com/data/userfiles/files/kisabetazuxep.pdf
    • http://bishnutoursandtravels.in/userfiles/file/99932991089.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=yo+kai+watch+3+dream+coin+qr+codes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 16792 bytes
font_01_sfnt_off000114cb.bin
6f4c8acdd3d193d1fa1f8a5a1739d8388d36c4435b57e19044e2ae58bca4f85f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 17620 bytes
font_02_sfnt_off00014313.bin
8c78fd97f42303ac150fa0cecba5cedc4cdbbc208752f4cba69f82e41e45da07
pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 11068 bytes