Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff9195eba9d40ce…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 19:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69940232d788af6a30deed04d641accc SHA-1: ddf87272e0b2068740551c85099f4635e1ddb420 SHA-256: bff9195eba9d40ce489bc0b2c56b0636f6c0941a88c10565120f2fa9a578a61d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect the user to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=stone+giant+unlimited+money PDF link annotation
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161486e3f5c2be---rupilibutupejosepoliwepi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/sazaxuvi.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109012306502285.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/46985475594.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416f9a13b0f---panuxitugako.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/60271272223.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1b92251c2d174e492db5b671b49683c2/fapawadezoninime.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/64698390542.pdfIn PDF document text
    • http://jsdarvin.com/files/24615141011.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ae9e9a8380674bcea9b77206ac411dd6/6073900447.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/bakutijijomofefokipot.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/79978861773.pdfIn PDF document text
    • https://digireg.si/upload/tubapag.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/selidemunoketafu.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/mosorirebawuje.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/divaga.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/mupelosu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8ebe0d8799d82aa54d298d965496b749/fufakelepejebof.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/luvubuxikafodo.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/92040530986.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/ximajupomozozopogil.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bajejuxoz.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/15215218984.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fef85d59ae---vudapo.pdfIn PDF document text
    • 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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 19956 bytes
SHA-256: be13a6a5a98ec9e90cd4bbfc50f95ce81dd28273cf7a6917dc25cdc6f95c5a01
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10612 bytes
SHA-256: 7b8c83b116804bd1db6139ffaa19fb7e06d1630569817a9bec124f2b492308a4
font_02_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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