Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa039668257f92e2…

MALICIOUS

PDF

75.3 KB Created: 2021-06-27 01:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31591ce301c6014fe9f1796e4fb7edd0 SHA-1: b32f93a859c2fc8d0fe9c15b7ad6be214d499a23 SHA-256: fa039668257f92e29baed62c06f0ab4c39d1953256deef151ff7aef7ca56b593
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://huntic.ru/uplcv?utm_term=fll+to+cancun
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/pgjtueis3vrf7f131ok51ekgk1/sovezevujoxovufonut.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/obfidioql8jeru6mp4npkha546/gofigefibupam.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a8f04a9c---zefejiwad.pdf
    • http://beergolfers.com./blog/images/file/rorubufazibumibabovemak.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb8f9e098---42643518437.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8864bd2d644375e2152911444e147bae/38579061515.pdf
    • http://coyada.com/up_images/up_images/povewatiri.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b595eabbd---tefelamugosebogositedi.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/gatimezanudugebedila.pdf
    • https://soudurelausiere.ca/upload/editor/file/fapisibixom.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/38946462042.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1b6e10208c1c17c74292883808c31f3c/gutova.pdf
    • https://nffcd.org/userfiles/files/pegofosolet.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2358350f9e2fd4efd24d1c3480f6b827/26148260776.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f200a99ecdffbee37f0cb35b5dca3318/rovikabomaboki.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5181dc19c1de56f3db85d9faae70677b/tigojufuferikibubuwaj.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081026b638c7---47201578508.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210612_FE07EC0829B2D9A9.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/cmra31ctdq5rrfp7brrd783992/89617497712.pdf
    • https://nonbodepsg.com/uploads/files/82741525987.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ae90e0679cb849994387353d30062905/kuzufinepamefijujazibuf.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078a053e03fe---dajidufawekiga.pdf
    • 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_off0000c79b.bin
95bb7e4700a93e43251cbeef32f78985cc7171351531d56c2d0aa22dedfd9b34
pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 9808 bytes
font_01_sfnt_off0000dd3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 16792 bytes
font_02_sfnt_off0000f550.bin
d05b71eec4b52f0811e99ca5c2d8e35df2f46ef57fa923e1d9d6ec951acad5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16612 bytes