Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcb6e75b5a98347…

MALICIOUS

PDF

99.6 KB Created: 2021-08-23 10:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e42759da2dcccdd48a63225639c1367c SHA-1: 1f3f6330ac2708d1912c453a52a14c65b04b9d79 SHA-256: dbcb6e75b5a983478b66d770a365454ff8d132e9e6d1e151f617a5d9e68e2b36
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eee3f5cb---41060201868.pdf
    • http://studiolorenzoni.eu/userfiles/files/nopimanagopubefuxule.pdf
    • https://iqmuseum.mn/uploads/files/85394926961.pdf
    • http://dream-mebel.com/pic/file/luroju.pdf
    • http://www.aadhar-interior.com/userfiles/file/sabananenodeva.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b843febf0b9---betaxirasa.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/kuligipizimo.pdf
    • https://nilsahost.com/calisma2/files/uploads/sukedebigibu.pdf
    • http://sarlampa.ru/upload_picture/misuzuzudunukipivuzufoju.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/efd993f756aee29a3a1d1d979a1a951f/nijeli.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c55755dd5---lekubutefinobowonipubemox.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/q92iurv98dg0oj817c48t40525/93927833838.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f903cc274---lowejuxikumozosexenudu.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8059d1f82---damakotul.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/49997677563.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d632292e7ee---fajafu.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d86d69145672f250c9f879ef1406df4/fuwabezesijamutasomikeru.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96d258e9ca---tevevirozonovefix.pdf
    • https://odontologosmalca.com/images/userfiles/file/2323297217.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/56b4329389ae2a63b24f1ea809e2263d/66881829357.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5789c10f12caa266d85c268b4f979c93/kusujenevo.pdf
    • http://massimobertoarchitetto.com/userfiles/files/63516573055.pdf
    • https://fenixfalt.com/userfiles/file/rabisuxuguzo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adff20bb81c---13202030948.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=classical+electrodynamics+by+sp+puri
    • 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_off00011a5a.bin
ace0e8dddfced09347a399577af9c9dfaf6fd30e6f664cc013df9117b6f4b8d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 20448 bytes
font_01_sfnt_off00014efb.bin
c8d26648dec6273ee1468832261c31190610c999c0bf0456ad27159905028f66
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFB 11060 bytes
font_02_sfnt_off00016888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16888 16792 bytes