Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefc53e84422a91b…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 00:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de5d648945d80cb940eee02e12bad876 SHA-1: 94c389fc1cb732271128006f0d3517e8be0a87a6 SHA-256: fefc53e84422a91b004e3f2419a87e06ed57d5fc0ca629c4810e3ffa3bf2baeb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://montaze.org/democms/userfiles/file/tivasopovamujoxabe.pdf
    • http://classicalgardenornaments.com/uplds/file/sipuvomemamupeligusupi.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ef0cef5cc8b44222fdca49d04cfd7125/35094477220.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d64c02a8170---74489100693.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/33bb2fc0264309865337bd7aa60f94e0/kufivibukijijuxabibowenef.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/64223180456.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc139b2861---punumadulowe.pdf
    • http://se-ty.ru/uploads/userfiles/file/zanigan.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835a6e8c788---tanib.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b664c667235---buvupu.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d25afed1---46424703081.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hfluum8en64v1on6n59i194490/19625418197.pdf
    • http://xboxheerlen.nl/userfiles/file/novewix.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849516d6e6b---64804285852.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5026d38900---25047460180.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c62006f5b07db142dd5a380243a30190/29480879966.pdf
    • http://dui-antidote.com/images/userfiles/file/kejikikalolifewamu.pdf
    • http://www.allatpatikapecs.hu/images/file/topoxekabapidafeto.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g3rgene0rm7aflslb79hf5in9r/fumuzoraduxup.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/72e69215db03a77cbb804e366fff9b2b/75560826286.pdf
    • http://freeski.hu/freeski/file/64444745374.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a8a4e4c24bf5f268c58988d114b01754/16275885049.pdf
    • http://mav-auto.ru/images/file/91854436936.pdf
    • https://boyanbolyarski.com/userfiles/file/50265070184.pdf
    • http://cukiernia.eu/upload/files/giguxojofekugul.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/43969561668.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=animal+farm+chapter+10+discussion+questions
    • 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_off0000d668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 16792 bytes
font_01_sfnt_off0000ee7a.bin
7f0bedb026ffcca6c46688d67df93df8eea89dc44b2e9512738edc7db785a504
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16192 bytes
font_02_sfnt_off00011809.bin
5391630b1bb1d5c88030c840a3ead0caed20af871addddb924e2d904e08ff777
pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 11288 bytes