Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c951c9680ab80c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 05:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dea20430a6ac865681a63d32565af86f SHA-1: 661edab870f905b57865d00be5afa4d01891c84c SHA-256: 28c951c9680ab80cdbf8a83d52901bb751db85b13d4c88497a6f95c81522c6e2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://qapoll.com/2015/vat/upload/files/pomuvilinuvon.pdf In PDF document text
    • https://trouver-une-ssii.com/img/pics/files/nodusewan.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/43323842872.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/legapeguzokufar.pdfIn PDF document text
    • https://atavio.ru/files/file/41089096390.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/fexaxavaxovevoravupevux.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50826205132.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zabeburetus.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a60d17a692---14722667034.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/85265094674.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/77163137214.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/6069461473.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/97184987399.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/liserufikunej.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/99025430832.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/99013007743.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616af88405---59998706163.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/deduvategekonatesokipelu.pdfIn PDF document text
    • http://workontext.ru/media/file/semevukamokixamoguzas.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/58384167630.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613163529daea---wanuwevebuwaf.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908043402.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/56971568512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=root+apk+downloadPDF 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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 10116 bytes
SHA-256: 96574871871bbdb4ab43c02871a6cc8b3f3f0746c47dfa8c45c2bb17746f3110
font_01_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 19612 bytes
SHA-256: 760c3e0b08013e7425fb4093b9b6179f372ed7cdabb7ea1c5daa2b68f28206ef