Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aa8dd71c4a363e…

MALICIOUS

PDF

82.1 KB Created: 2021-07-24 06:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b16d60c53b1ed200dedc3bb784f9fee SHA-1: ccce2672b874afb355578ad85a71b09d0b3ef2bb SHA-256: b1aa8dd71c4a363e2c4a838d2ffe94eaf5d601fd882d1f5361b883010dc91059
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://geoass.eu/userfiles/files/66439741703.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/bo4ho9drs5vpu5sis4v68pbabn/86739990323.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f411b01da4---23566143417.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/733ors2fu03kk17s0trqd149i4/forofarap.pdf
    • https://atamergranit.com/userfiles/file/satimida.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/pudurunonobibumenavu.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c9347ffe1c219ea8043ba8285ecfa5b6/14461931058.pdf
    • http://piqiso.ru/userfiles/file/26837217125.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02669cae1---23001565432.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d2ccb1d4---39302645938.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3958f8227f---46131398704.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rqi70s4e4nje6okdrt0ekc290l/bikimod.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629627baa6---tarefanulefanibozis.pdf
    • http://ymmicro.com/files/files/22280435193.pdf
    • https://dbjadow.pl/attachments/file/fefaxaburibipu.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0500e4c30---90769530925.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8dea2499d7f2cc90dd977f0434152340/sigemoxisawifaweweve.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1f88e4deb8fa064aad10aadba6fe0e3f/rukelo.pdf
    • http://amsasecretariat.fr/userfiles/file/19166950533.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3b238d83---54108337868.pdf
    • http://czdashan.cn/uploadfile/file/2021050412480573499.pdf
    • https://adikketiga.com/contents//files/97569637694.pdf
    • http://tubietelbar.hu/uploadfile/porajosuzemefomulin.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c96632b547b871989d1d7f64150dc946/demivijoremagexuwu.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cabc6a4649---32925331582.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=solitario+spider+clasico+gratis+en+espa%C3%B1ol
    • 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_off0000daa1.bin
f67319ab4605c0ac0c1460a1c7d0489e0c802b13b02ad0205ebe5a89a0b3dde7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10968 bytes
font_01_sfnt_off0000f3a9.bin
886eee862877140ee251128279fa87615b0510af9da3b61496f69d8dc601313a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 17652 bytes
font_02_sfnt_off0001200e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 16792 bytes