Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bdddee61f05643…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 19:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3021910fa5ac9e581408e693667e5dc SHA-1: d67b03d5894c2473f4e251276c250a2c36119fbb SHA-256: a5bdddee61f056439ce15b3094fc1d408c383992c1de089df7e05e68d8449068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and the ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of external URI links and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://chandigarhdatarecovery.com/files/file/lovamodagoja.pdf In PDF document text
    • http://re-view.online/fckFiles/file/wonuvodogusanemoxi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d0d7e7d2c62720727035f0c13e8cf97d/23280109094.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d5796599---sosixojireziwuli.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/zigixepemoz.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/fibip.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/92669676109.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/345ca3c965bef14f0398dc7c87f2cb46/79727750850.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b3ed2a56---kimofejufadiweku.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zitawozebugeka.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/mujomodasuwabafudaluzaj.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/54943641234.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/77606480168.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608842d64cfcb---muvawozivejamuxupemeteju.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/xojikubakadakimov.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60da44338---52864325843.pdfIn PDF document text
    • https://mattress-leader.com/media/12044110626.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf4a81052---66861843178.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rn2n4r64ii0go6dklv5nob7en4/40139524342.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/duzup.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99ae2bd58---jefizex.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3212958e4d01acdcf56b6ab6d0f1e8f9/59996413707.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa466c66b4a---28796821940.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/78390126514.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/depekixedikiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=measurement+and+scientific+tools+lesson+2+worksheet+answersPDF 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 11132 bytes
SHA-256: 7307d49d4b388812585189a04207fb7c90a0ead764bc7d57b1d7fc9763af3809
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 17520 bytes
SHA-256: 153b80327c48d14d4b03d55fe9d218d9a12ecfba380c6dddd960be21fbf5d2d7
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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