Malicious PDF — malware analysis report

Static analysis result for SHA-256 179616b751f09ffa…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 10:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51a2e33708a91663bcd1374f435c02c7 SHA-1: e9ff486c9cae12a82783959f3a5c03cacf48f902 SHA-256: 179616b751f09ffafe5b98f30a68c63a7fe9df55abe29bd5ff26d581035258e4
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, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URIs and link farm heuristics strongly indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=how+to+reset+garage+door+code+liftmaster PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f455c176f---48497640418.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/gujawumiw.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cecd375b0132b44f5617999c5648165e/minezafezefutupov.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/49891493699.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/pulefikes.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/92cfee276d058eef64cc9bb9335c00f6/xotezarukozuganudos.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed180be96---84417518401.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f689a928a---jirunelubepumodugobajir.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/691b9aa0b0f227901572ffa1ad265999/27157067468.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/66103057470.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/zinosuzudiwi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/778lhaogjh8i2gu07bhl9iflsk/53261976071.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/mvj8nke1a3ukb0e0lb3pped6bm/72161869490.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3vkt0k7a4cktc5d5o2jqg6ke83/rezafos.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4e87dd255e6f451f487bb2296c561be0/gazexideza.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/648af0e2d7ada9bb7b9e03d06bd68f49/66285574578.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6651cc2cf6---rilegepuwebetujas.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/novuzilunirazoxadax.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092039a68913---zenibibusodusexetelapeno.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/buwapixorupanetibefi.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/xejopirar.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608637788020d---zurulaxuka.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb478cd6924---3118835902.pdfIn PDF document text
    • http://eva.am/files/a4ea4360a70f676c.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_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10792 bytes
SHA-256: 61bd763d9c530c14d69aed826f8a3201f3a067a2c6f9644d5abfeb9f3867dadd
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 17476 bytes
SHA-256: c948feeeddc59b876c163a63c7398bf821506bc2d598c9d4a7ea18577c4506fa
font_02_sfnt_off0001363f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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