Malicious PDF — malware analysis report

Static analysis result for SHA-256 df08795b35fcc02f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f2e8117490c00e141e2040e8f56d83e SHA-1: 63e0558398b1fd40ada20d4aa2452bcf8bba3910 SHA-256: df08795b35fcc02f4c6a74e86af731d4c1fc5493d932fa5192a821c12e3d5a48
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, containing numerous URLs that point to other files, some of which are also PDFs hosted on potentially compromised websites. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://triatlonshop.cz/userfiles/file/xuredibidisuwomanelazuran.pdf In PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/80908572776.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133988756418---1056513392.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/58458219223.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kegekepebirofepiko.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/10029363a8110a877613dd87e7c6be25/pobajiras.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/19981213778.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/43050894097.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d580fbb910---lebupizot.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/ramugokefabozetoperofer.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/97126518997.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/31260605019.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/22537191260.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7c25541b2630c115e09d8fabab4702aa/sawuxarepaviwogem.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/wefebumivikimozuxagagosi.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/60212345775.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/72824839866.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/53715577068.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kibajuwegipewigiredijij.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/97936919585.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/41gqdkqf4h7kprelivbi8np430/90475264782.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/ribunonaguzugi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/13420669997.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/51575149871.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210904043528.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210903162159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=avengers+endgame+full+movie+online+free+leakedPDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 18668 bytes
SHA-256: 5fc4be4b07d42f2970351c6d04ad54c4257692b7d2d6c9112fc3e3dbec3eaf58
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10840 bytes
SHA-256: 8dbe009f8fd5c1b618918187052b119310a8bf5fcde5979a2ffd292bc3b76bd2
font_02_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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