Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbe8b5298dc7418…

MALICIOUS

PDF

76.1 KB Created: 2021-09-10 09:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89a3892882db329b5916fd832c6ba6ed SHA-1: 4af942d68b12bc4bdcc0e871bf81055aa22a7b88 SHA-256: bbbe8b5298dc7418c34cc408c5462298eb97fe56fdb5fe1366f15360c3c9f446
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=other+internal+storage+android PDF link annotation
    • http://ourconn.com/userfiles/file/202109030441317600.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/madenele.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613529969362c---10733508890.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zezevezeziriwosikenema.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/fobuvaretidipekisabe.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/nujomudukuzivajev.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/10059079230.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jugimarigewidan.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/71871637392.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/63420322510.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/79678155135.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/rufelavawubejevovejiva.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e32cd955e---duvexofodaluwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff51e61c87---91910178595.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/54956951715.pdfIn PDF document text
    • http://mutitar.com/user_img/files/18890779617.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/1709671562.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/pulilefufeta.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/91955776088.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/24t0mo0fgavlofebidb6frvna3/suguzuvinojewonogem.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/xisapoki.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/dedukeku.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fidaromagipukip.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/57255adf26d7325c80cde3d739909ae9/xabimoxezigudina.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137551f79646---6450787231.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/kivinisada.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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 10552 bytes
SHA-256: 44dfd2a8c269e75852b6489ee91cf0550bc60eb40315ceb3486c6fdbd66b0d61
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17500 bytes
SHA-256: bb5b4cf29bb0bc5b1c95c63df81a66d974ba8159bfcd7b6d09634ff83f812647
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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