Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63f7dde9a2754eb…

MALICIOUS

PDF

96.0 KB Created: 2021-08-02 01:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5622c73f1c29fd35f881a80e6a0df20f SHA-1: f8547f58d7c8827d915e7865c4502b5bfce9cf7b SHA-256: b63f7dde9a2754eba0f70ad5102ba598757d863a89e80a95aede8a0bcbfd3441
156 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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators points towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://nestsearch.in/admin/uploads/file/kuvabubikademepodesopo.pdf
    • https://vibangthuaphatlai.net/uploads/files/20157448621.pdf
    • http://terezmisszio.eu/files/file/51073251493.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2589bef7632eaaf5d6c72ae634a5a1c4/wajurilowewofedamanenuwu.pdf
    • https://soccerauquebec.com/userfiles/file/rukoxa.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3b88b7b138478b0c9750cedb014ccb1c/29112637890.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac237b0053d---32233951272.pdf
    • https://africanresearchcenter.com/userfiles/file/11136380613.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a0bd88739---92167166281.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16f9418b4---28750946486.pdf
    • https://communeouchamps.fr/userfiles/file/7592939064.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/xukufowajoxu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952c4022a38---78681146996.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/55882758743.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/18157294752.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa318dc1c3a7814f04260b26995e47f1/67666380164.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c04a1a93---25918888207.pdf
    • https://lotteppta.net/beta/assets/file/lumegajinajanufomupumuk.pdf
    • https://numen-wow.com/userfiles/cloud//files/nojomifitisaxeritipaga.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bd88367603805ca7acfc5fbb0e132972/lobusoluxuwaposobe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=captain+tsubasa+dream+team+hack+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001053f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 16792 bytes
font_01_sfnt_off00011d51.bin
a6d8ef9569e6d1108ee54488db5cfb61beb364ab14b959025741c275004914c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 18920 bytes
font_02_sfnt_off00014d96.bin
fd91a6234b233e690dce778c0df6b3fbdffcc6eb2c443557379759d3fba61b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D96 10976 bytes
font_03_sfnt_off000166a9.bin
d16ee160821406a9c793744c499e57cdc7bc80a3d1c774531b6715fad066e418
pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 1936 bytes