Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d0e8fe6f0392b0…

MALICIOUS

PDF

151.1 KB Created: 2021-06-30 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb6c235856d5cd2e9e2da1ad50fa810 SHA-1: 5793a15a8357d015ff7b084264e8efa9411eb2b1 SHA-256: a1d0e8fe6f0392b012a4525114c6dea8925f5b817430706ce2f858e3d4131dc6
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm and a lure related to payment redirection or bank detail changes, a common business email compromise tactic. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or to initiate fraudulent financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://soalmatematik.com/userfiles/file/nusogafipowazakozalolino.pdf
    • http://syuncyoku.jp/upload/file/sogepalexoviposinu.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/73ba6939d5512d086d07013c412d72b2/68616181165.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb888e8131---6053076780.pdf
    • http://n-production.com/upload/fckeditor/file/90118400970.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bc5aa773b92841b5f9694efaeab140e/xarexonoja.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/15051545902.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ced69d464b0307d1050382e56431a6de/9110312450.pdf
    • https://triangle-electronics.com/assets/userfiles/file/44680128183.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/83993067656.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8i07tsfmgftlen87v3loj0f3dv/zoliwumenusune.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5a31e2ad04f79e8a8562216b14902f23/96516942974.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c6535596---wiberebowo.pdf
    • http://tofuyatogo.com/uploads/files/movitamefo.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864b426668c---tumututobagipoja.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16214666700356.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d3d36e79---jabitoxodavelaxe.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd4c64e4e---kotuxitimewojavivokoxax.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a2a98ab78---89111984066.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/57f52u8o4ckf1oeb58fcf5bgk1/46151806604.pdf
    • http://creptiles.dk/userfiles/file/81445773625.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/fd14b2f4ca0c98debb62d690f3b5098c/31512840482.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e868b249b7b505d486f1b40197962f68/dapinepo.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de523568d---zitudiluniduwob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=outlook+for+ios
    • 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_off0001f196.bin
77974d3adb4e60d188f169cb30c84f9a5de0bcfb747b5bb345762c20c824aaa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F196 17884 bytes
font_01_sfnt_off00022082.bin
b202bb190b047b8f60106f7c866b03dccc7fbecc3aed2e8a5b7506d6ac72b144
pdf-font-stream PDF embedded font (sfnt) at offset 0x22082 10028 bytes
font_02_sfnt_off000236ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x236EC 16792 bytes