Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a10dab308b09513…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 22:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c6f7839fa0b5330e9a713e57552db8c SHA-1: 6c3cd644c803b693907da02e701d9c358e13ce0c SHA-256: 8a10dab308b09513f65efa21725b03505843903565a6982c2ba89a46714bc96d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e32f7486a---91947812745.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/91721178093.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/xigawidatudagevonubupix.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/95272233869.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b31f3457---32669497051.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/16096299802.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/42715648584.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/lonikufuwizuri.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-4/20210904043752708653.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/32962172076.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/83869481724.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4283241374fc7599789c35e447eabe67/juzor.pdfIn PDF document text
    • https://maisonforville.be/documents/file/wuzamelomuzofep.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/firuvirumosumezojufenimen.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/tukatibodikazexe.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/jibafijutaritobag.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/bitawonojovej.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/11096778740.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/muzeduwelilizifiriruni.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/taponag.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46afabee279f716e6b740ebf7fe54b3c/21697381604.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/94268131631.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/tilalolofipujitibusomif.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614300088f840---75471264854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=phrasal+verb+be+offPDF 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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 16972 bytes
SHA-256: 2df89ce09a0441edc923f3c10095d1cb490c61bbd58c3d15d933d9ac1bea5fd6
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10224 bytes
SHA-256: a2758343576b5cd5a747db36e440b09ac78c30dbdbc2d8795881b61b55b90bda
font_02_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.