Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7b88081fe215ff…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 03:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67053885a64f110e2a4f395d3edc3525 SHA-1: 1a7f6f198e04f669b08e69bddf0eb6dad23d6c7d SHA-256: fd7b88081fe215ff266d9abb480e6fee15451b4081f45e55cdca7c0f4f6b4f7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress sites and other potentially malicious URLs. The presence of external URIs and link farm characteristics suggests the document is designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=android+vibration+komplett+ausschalten PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9mml4aj3m7dba7ppoev2ll2k70/zipaj.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/20542769087.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/45258891539.pdfIn PDF document text
    • http://remobudostol.pl/pliki/88253720492.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/54572854521.pdfIn PDF document text
    • https://conrays.ru/f/data/24824703631.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/kenukulezegug.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/62190083494.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/kuwijikubetiduwejizibo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wirumudonofibifugo.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/73447125936.pdfIn PDF document text
    • http://holzbau-napetschnig.at/tejuloruv.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64340317078.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613728a05b243---54141243094.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-07-51-01-74.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/15389428831.pdfIn PDF document text
    • https://aayams.com/userfiles/file/feparexurolezog.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xoregenolafa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rrd46pougqf691uop49ov9hgo6/ruvuburaxizijitu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b0173008---87765219217.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/vutidepuzanulov.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7mjktg82q09vjnh5rsfbgcpdlm/95369914007.pdfIn PDF document text
    • http://charontrade.hu/data/file/20134533248.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kuwogid.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/70303864017.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/fojuvizikoxopubejuxa.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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 11156 bytes
SHA-256: 29bc453592660e17d20d35459c65c2cca088b8517814db3703e26064ffdb18a0
font_02_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 18544 bytes
SHA-256: d50283d3f3539f08208275d4d266b1331c7278f437571fd5e40569755876b180

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