Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a4719f822d823e…

MALICIOUS

PDF

102.7 KB Created: 2021-09-18 11:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60037962d145d5e988d4c83bfa90d170 SHA-1: 5010928a0d4db5d722525668184237a53e7ddee8 SHA-256: 71a4719f822d823e73d98b1dab8dc60719be4b6983faa7507bc055e7428eb1c6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. The presence of embedded URLs and the nature of the detected threat suggest it is used to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=gta+5+cheats+ps4+unlimited+money+phone+number PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614529459b6d0---90025577846.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/vajopuxamo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d667b54e---54686852192.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuwidiwumigife.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/vazovesuzopesun.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/wifosunonogawi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2543482599.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lts173paa8prns1b63ntl32lpm/8324023953.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/50203533057.pdfIn PDF document text
    • https://suksesunited.com/contents/files/95597863285.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/41123099377.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362f475726c---75596127680.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/7872279542.pdfIn PDF document text
    • http://e-menu.hu/editor_up/wuwagadotomakopagovukuw.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xagolegunin.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/45625613590.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zuvaxu.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/dumoruwazud.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sizagotutilimebilo.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/mokijo.pdfIn PDF document text
    • http://expresskaliski.info/file/41817115611.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/wedawi.pdfIn PDF document text
    • http://svx.su/ffile/file/jijamijewotusu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14730 17180 bytes
SHA-256: a8122def213b0a4f949ade382d862e5c73d5ebd1136760907e7dd7d981fc7605
font_01_sfnt_off00017409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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