Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72c2145018cc4d2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 10:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5738a870fd127c7692c83c3d10c7aa6b SHA-1: 76fb4d4066869d03de7f09dc6495e51aabc91b5d SHA-256: a72c2145018cc4d227248abac66b2b4615d8dd859341c2c6df7007d433a474cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further exploitation or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=comment+associer+des+pages+pdf PDF link annotation
    • http://df-foundry.net/d/files/koparibejumaduzularugifu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/nufuginelaz.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/ramobesazafazugizol.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/dotaxovuwapepa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/snokqtl2t5hdikdf5oi97f4fu3/51848900735.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4f8920a2fb302ff199616c4cf6f5d451/64540006468.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nuxuvopewuxikalapo.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/80140802877.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/fujokowerijomuvufo.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/23942070789.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/31204834911.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/21307622545.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6014eba306---63622162315.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/fadodedivisasudesupuxunel.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/nepevenugufifumoxunuju.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/misasefatigo.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0u6coilnrk7qo60t2e9s561rn0/50289178857.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/72358982717.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0c4cbde4---xixixomupenanalifukaluwev.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/jusiluzaduguwuramupoga.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f5c8d9fd---54216669176.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/mezukujefaw.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zamezelezibub.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/mepatizanefilakoxukaj.pdfIn PDF document text
    • 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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 19052 bytes
SHA-256: c73b419c4b9faae62bd72cce8e58467feb921a32e8b8be15a8188d22cd1ff66d
font_02_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 10948 bytes
SHA-256: b55871ca69291bb802d80c2596c8d14f6dfe838ce5b99e0f448ce97f628ea4a2

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