Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0eb5e7adf14733…

MALICIOUS

PDF

91.0 KB Created: 2021-09-03 13:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b613eadbee3090c3576943218ef1bc2f SHA-1: 379673e7b4dec88fd34cddc506d17325cb5e8914 SHA-256: cc0eb5e7adf14733bfdb2696c3b1846a8168aff31db8a99c92b6dad81bd0eacd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's part of a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://weighlessthisyear.com/ckfinder/userfiles/files/pugekidezoguv.pdf In PDF document text
    • http://fandimnarodaku.cz/upload/file/jexofiru.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/17479804670.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161294bab87ef1---wateweb.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80933206606.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26725607633.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eba1aeaf6---10482573339.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b47abacd950e59e3c767fb431d52f3e4/nasijezem.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/nemojulasopekewolinolil.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a6249a737---15127400811.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/53123985909.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0df22732a2ce0332800207ff9c7a56bf/xunisawazilejo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jlaqvh4kti1tafcmk3sb30d9sp/baraxobuvipuxixa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd52b89d628---69182115883.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/66724301288.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bd7c9be670c45b89e4ab8edea5e62f17/24708102427.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7462b5b196---63939936022.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d0217c41---49767773081.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2267b71bdf685442fa0c5acea6930a65/88790859384.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/870bb1feb3a2de985dbbcab12a319790/31414612636.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/orce01lfi6if83b6cefchhv2v3/78100005980.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/sedifigomaga.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/jasugawelanofiralasunol.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d318cccaaca---fefasijed.pdfIn PDF document text
    • http://ipublicity.cz/data/file/96009227900.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/65900571564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=osmanl%C4%B1ca+%C5%9Fiir+metinleri+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d1ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD1CE 22848 bytes
SHA-256: 624b51b62c7ca89424f9a671b6cb7a904ee79a06a6a55cabb7366bc1c380c047
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10976 bytes
SHA-256: 8b67d863014e95b2749feaad9b72236b471ccfae0ddf5a57c150c05133e5f09b
font_02_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 19664 bytes
SHA-256: 2549ed83a402a378a13a024e44496ee3af1605363079ec24b6fcd294092f56db
font_03_sfnt_off0001439a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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