Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c878157306ed24e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 00:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c990181aa43447376bddfa0c1f4114d1 SHA-1: b149b08e0b3b3c4acaffe7f8fb6b1ef67aeaf402 SHA-256: 8c878157306ed24ede295f6047d8eae548cc3d436256bbfec7cec03239866edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://towa-aaa.jp/userfiles/file/21653156259.pdf In PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19554690576.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/20803780598.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a947d54298---47025715239.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/53af02d1676fddda2ba480623a313616/98881405367.pdfIn PDF document text
    • http://coffee33.ru/archive/file/18358518974.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/86844885816.pdfIn PDF document text
    • https://tessuno.com/upload/files/6117b17bd8075.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/14180023261.pdfIn PDF document text
    • https://ags-car.com/upload/files/85587723024.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3d006142---61349898838.pdfIn PDF document text
    • http://dakmet.pl/upload/54190751275.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5cdee13c---fusoligiligowato.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/miretariruzebaruzovetupe.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/enrqdbcdc5ik4kveaou8p64soi/dotitaj.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e13d218b8---ximagigexejekilo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5k44eb67u7452kptdbidp3vuf7/pogapanelepatavekupoda.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9fb699273cfe6d8d8f0e8573b944d1f1/rugifuziduluwem.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/64935645711.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/56176804028.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9403a86d84ab45b3795fa830bda79f65/56318065797.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607227788a482---bojulu.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/wuxobometekobewes.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bc2345ad96f242f5199d4d10b0076c89/zijulixixinitofitovij.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/50078233433.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/55927756059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=calendario+escolar+2020+argentina+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 11068 bytes
SHA-256: fa358e95bcd656d1cec7d1c37b43eaa6acdf0619548526cae929232a457d1c63
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 19032 bytes
SHA-256: 9c222270860f4655d2cc3853220eccf732f9e69113f8804cea5088d9d4a3a4e3
font_02_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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