Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf90738d057459c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 23:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a211c94d78b3a0626eb533ab5816dea6 SHA-1: c053daccd8f025e04d151306b9e986288f214231 SHA-256: 9bf90738d057459c15160c3d773a515aa5889c55bb88411249bb056f9478dca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=ipogo+for+android+download PDF link annotation
    • http://mientrungland.net/uploads/image/files/72494108590.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/77831583324.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131589ded39e---72776653987.pdfIn PDF document text
    • https://thepainter.asia/upload/files/87879991469.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/wavezeg.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/xabavugotogipojig.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/soloxotirato.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/fejojetejituloveso.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/65165610431.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xararilebugeta.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/41506799971.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/fidepikazejagivanowidif.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zitarebupepuve.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/mizukipag.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd14439d1e---59546646803.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/mejesagokabi.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/47723797243.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84938796256.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd86a09da6---senuzudoduradarewofuvanu.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/45756115270.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/52400397861.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/nirujajepaxosimuvo.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/25234632490.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/23390495488.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.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_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 10312 bytes
SHA-256: e3b01a260bb96f9d66b7c6bde48f24b3bc82d977c1eaf102fdeb0ac7167b6716
font_02_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 18416 bytes
SHA-256: af5990295507bb5c89f7373fa344881c82678845a5258d18858c7dba2100db8b

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