Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8882f65f9d0acf…

MALICIOUS

PDF

74.9 KB Created: 2021-07-01 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de72b3892824fd79caa99bbcfcb27ce2 SHA-1: 2ff31eb2fe6d115a14008a2d6336f38915444156 SHA-256: df8882f65f9d0acf5444f2e241f46f76d4c94f77e45c6b04d5b0fb14d6b0e8ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=rich+gang+50+plates+mp3+download', are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=rich+gang+50+plates+mp3+download
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9dbe5f03ee5ba7af8abdc15a31c3d0a0/datibovepopem.pdf
    • https://nadamasristorante.it/file/mujenepujitalegutav.pdf
    • https://akapacha.com/userfiles/file/82348537208.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce386dd4b---93638483664.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f3c8eebacbfa66ba4b694ea9466e618e/lobagujanaj.pdf
    • https://ecoretras.com/file/bibuwasadaxozawetabeb.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b709747fab---66329594659.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909e6645495---21904529069.pdf
    • http://asupuro.com/upload/save_image/files/25068208141.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/46bc6abb2a64dd66ce7a3159b9fd0a8f/33608867592.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7abb5c3e1---18324579640.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9774k6hrh0rnl97lc886vqg372/wipenorosexilaxor.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/aac9bffa57d6d29c1adffa02c38f1882/topivoduxaguwogumalosebe.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071c85fb9f75---90856693266.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d8590bad---88144193562.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a72c69e24cae8083684b1ca83e4dbaa1/62909452820.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/366281c07c2f9336a4a837bd28915827/lajefesamazarasajawe.pdf
    • https://aplusadvance.com/naver_editor/data/file/2551089625.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4da1cfd93---kijalo.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bf9e0e3d18f02778bc5f3afa5a19c978/3494989575.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/445d6eec0014f0b36c41b3afa277b5fd/39434495684.pdf
    • http://icmasistemas.com/userfiles/files/99313060784.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/jotevamuzoxuvugobuj.pdf
    • http://upoart.com/ckfinder/userfiles/files/wukiwelugonabirevazo.pdf
    • 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_off0000bee7.bin
cc3866ab06136005178f86b6034f491de951515c53b943a12a47983c5a9c96ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE7 11420 bytes
font_01_sfnt_off0000d992.bin
4a3f1786021224b2635882654c660990b73552cdb061053c1fab7c226bfb31ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 17360 bytes
font_02_sfnt_off0001064f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 16792 bytes