Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf8bc18e0fa6c84…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 06:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac6d959a7775a49eb395b679c7078fe1 SHA-1: 74d319f74e531b3ba6b307b0b64085c7c76fd8cf SHA-256: 3bf8bc18e0fa6c849de68435cce979317c389e1b0c10202c630960a0ca907883
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=tomorrow+when+the+war+began+pdf+free PDF link annotation
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5f8a700a---kojipuniwidirabuwanuf.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/56057411969.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/zonosutodiwetanigaro.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a77cf297f8e36a20f8e24478d3eb8ba6/37025838120.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nisofutogajemidevivarin.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/gemurabamose.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/resegoruladulabor.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/bofuko.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070122055393.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/vobisobakobidekujebubo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f11a0a13---11064781978.pdfIn PDF document text
    • http://soles2walk.cz/data/file/82930923388.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/22187907746.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/nemuvopulefavaba.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/291sus2b2gsnel7navfgpa8fe4/rerifiwobo.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/jagelosemaxevozifob.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xuxutalivevupesipowa.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/89464982705.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160720abf5748a---14475946967.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/83057364573.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/90360341531.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f4da80c2de3a28cb7bf6f56db392405c/57071903224.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/21643212429.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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 18808 bytes
SHA-256: 7315acd63a2f01d4ed4dfd8f2d60b6bbf2ad9c989a9627bb1bae973b5ecb2230
font_01_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10828 bytes
SHA-256: 26d8f205535e37f3fdae54404e28542e6d7a8cc2e6e1c2c970936846786e0cf3

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