Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3579d187edc96db…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 01:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd6f5c789d03101db07bcee9f9f07e70 SHA-1: 64bc9df966bee3e9ac45b32912bc2bcee14b27da SHA-256: f3579d187edc96db79fe95e1e2eb51214daa9a1cb824ba630ef4bf0e308b1db5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or unknown domains. The presence of numerous embedded URLs, many hosted on potentially compromised WordPress sites, strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n4rpf1qopvgdvv1ppvflbou1im/dalabimamunun.pdf In PDF document text
    • http://thuocamakong.net/userfiles/image/file/13103430042.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/livuregamutonemiwuxef.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/42455624517.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/zejubolonupon.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/puxivagoruwoj.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/42212806657.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/zodikakewuxegorix.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/nogoxarupokazirabazugajo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cdac1df0---77180631540.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xilomedasaxexowaxofupelar.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/kaginogo.pdfIn PDF document text
    • https://le27.fr/docs/file/10026031053.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/xatememadowowagapumisa.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/vonoledirekimivoxuzun.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85793021f2---73628662665.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/xanatowezoxikabutasa.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7bb1c2dfe2d723895e723c539d675df9/44389647802.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5cc0a17b2---18449897165.pdfIn PDF document text
    • https://southafricapools.com/contents//files/vesufizijawemopid.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/ligaxiwevofimawafefo.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jewapejebib.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46efd06150---31329866087.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/tegevorovijetu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609664168416d---76079674264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=netgear+powerline+pl1000+manualPDF 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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 10764 bytes
SHA-256: a5bd6b79ff544a4d152ea9918e279c85183117dbe9d34c9e56270008695b9566
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 17408 bytes
SHA-256: 0b2f03a399bfa43f05e192e3675b7babea0fc5c9a79e5c5af2eb15166a8942ab
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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