Malicious PDF — malware analysis report

Static analysis result for SHA-256 b973f977e9e58c97…

MALICIOUS

PDF

100.9 KB Created: 2021-09-14 15:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d15e8490bb368c70f890ebe80bff77de SHA-1: cc8d52ba18521fbcd7e42d9b7b82f94b320d08c6 SHA-256: b973f977e9e58c9714096999254d79ace92ec8180c9d5ba3c91e17bb86b4061f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://cructi.ru/uplcv?utm_term=pokemon+emerald+gba+cheats+gameshark
    • https://idd.no/ckfinder/userfiles/files/58985328441.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fc536c0b---lakikudelu.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/tozefekigitebum.pdf
    • https://xehowo24h.com/images/ckeditor/files/pufuvesulura.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161309dcd385d4---65894431639.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/13125936015.pdf
    • http://teplolux72.ru/upload/file/9916146326.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07987c00f---77087424472.pdf
    • http://global-leasing-management.com/uf/file/24417740180.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/88226566792.pdf
    • http://foto-preiss.at/upload_files/files/76023134638.pdf
    • http://kcemsp.org/upload/editor/file/68641207762.pdf
    • http://sukhonthip.com/file_media/file_image/file/40124505245.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/9959317158.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/44552732875.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/natod.pdf
    • https://lotteppta.net/beta/assets/file/64638160818.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/kibupekasiba.pdf
    • http://anthonyvienna.com/sites/default/files/file/xotodufaxi.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/abdf597e019591f1f4d5980fcf980661/80249873754.pdf
    • https://oxi-dental.ro/imagini_ws/didajesusukibej.pdf
    • https://binhvi.com/upload/files/defafizafinapetuki.pdf
    • http://raffaelecavazzoni.com/userfiles/files/33336428076.pdf
    • http://etpatatietpatata.com/userfiles/files/najobif.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/xemijokukopiguwijarafewek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
font_01_sfnt_off00013a96.bin
9afb3731dce1dd07bdb4863d463344cbbf9b28d35984d4ac34ffb3035d47a527
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 18888 bytes
font_02_sfnt_off00016c97.bin
4779d99af19307e689b6f3720cfc739f94c76d5f9381162156f2c4c575d91ff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C97 10960 bytes