Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e900d29c5072f0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 23:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d9fc7bce2a1cde2d15134d0ca1df05d SHA-1: 41e43686a7e160c1b849395dc18f8f1d62e3b79a SHA-256: 83e900d29c5072f08f8ba036f9cb72ef885d8899305b475336d146c0740909e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF link farm indicators suggests an attempt to direct users to malicious content, likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sosnovgeo.ru/userfiles/file/gafulidirinixixulor.pdf In PDF document text
    • https://yuvasarkar.org/userfiles/file/darifumajo.pdfIn PDF document text
    • https://km2804.com/ckupload/files/fezenufotodefikusubo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/31501080138.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/bikonopi.pdfIn PDF document text
    • http://nova-auto.com/upload/wogulezafaropidujol.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f602be8a2142c332e2b2af1e7f0f25cd/zodonewanurotinok.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/16a7e9daf9e7fe2195c1c4f7dae3479f/89963860684.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/gubiwulekiniditibanugoma.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613596c8c37fe---44001469122.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161356b8a8f417---xazisimukatewa.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/torokuluvaj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131576253a54---suwumojanexego.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/supasobitigozususira.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuwokutufejotagipivop.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7tj03frnn9tcea9180crqg96j3/11752915606.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/84355823047.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/98385509273.pdfIn PDF document text
    • https://tuinvandecruys.be/file/75868443974.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905053207.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/9923332319.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/25635218470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=create+animation+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 10228 bytes
SHA-256: 6d810f5644c8227b4c5bc5094da1378ea64d6f4a696d02ca1ddeebedf6a3196c
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 17304 bytes
SHA-256: 2db2bb2f86d697fc78f4ac108456f2e9e3159c796928d1aee03076933631376f
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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