Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ba0fcef3404ec4…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 00:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc7529b933da30ca2eed42268e694cfb SHA-1: 7f35c593f539a2028ff251014a92a4f8d8511a2f SHA-256: b9ba0fcef3404ec4ffdea8dc94ddb7c63cd6a891356892c629101c167184770d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting it functions as a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to the exploitation of SEO techniques and compromised web infrastructure to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://daotaolaixesontay.com/uploads/file/57901869071.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210604025430.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/44778535603.pdf
    • http://shriadinathbank.com/uploads/70264433099.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/kagogezodozarak.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4tff1dma1if61pafdv2ni9kl3e/97167323862.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e395eeaeae---bigilinujepedojavovu.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/63572485310.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78503b20556244c7789e7706275f4d8e/fovapisokonosijakojivete.pdf
    • https://numen-wow.com/userfiles/cloud//files/fozejorobekegir.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3b688342---12085131306.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j49u72nmevror7fui8c0th8q59/molipasotawepufeg.pdf
    • http://charivne.info/images/file/sigonorikapofivamiru.pdf
    • http://alliance-ltd.com/userfiles/26317072993.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dc8d9641---puguresazasewilok.pdf
    • http://10glazsikeyrosa.ru/file/vukuveru.pdf
    • http://highendschmiede.de/highendfiles/file/fexiwonabugufutulu.pdf
    • http://lucavolpicella.it/userfiles/files/73871092459.pdf
    • http://standardamulet.com/files/files/vazagupufubagipazumosuz.pdf
    • http://aisef.org/uploads/userfiles/file/file/nuxemuvibegaxozox.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6ceb9741---77058206996.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/20dd30e036d3439cedf2f235b443bdcd/zigorelawopipurexodidulus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=virtual+villagers+4+food+after+berries
    • 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_off00010a04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 16792 bytes
font_01_sfnt_off00012216.bin
1f681b4ff8def0747449f19e8392e5aa881df97e4bdbacfe1f0c1200a1623b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 18492 bytes
font_02_sfnt_off00015288.bin
8c64f1d287b592352ec42a3012a154c3a49b7c64ba867f44d470c5a9234b0125
pdf-font-stream PDF embedded font (sfnt) at offset 0x15288 10780 bytes