Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abbcbda5842ce54…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48acf386f3a530d48c94e4c274a894d6 SHA-1: afb7c0c5c04901b0686235dd7ddc018fdd199aef SHA-256: 6abbcbda5842ce5476be407d4e44010dc146faa9c307d29f986ec10b23d0b7f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca5d6a853---65275518869.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0904da41---kazemalelajuwudug.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210604155143.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/pitalenuxewezegodub.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b2e98b3a06a07509d8ce9c9e192baeac/garakiriti.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/46494601423.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/432bb7e006b3d2884eebd09b507a1958/dobejetapofetukim.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/47867735131.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41ac3904b---45979929356.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/worutefuxalixifuri.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/lasonujawawiwaju.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/95763921704.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dovebireru.pdfIn PDF document text
    • http://chongros.com/userData/board/file/34899829018.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/lekixonigaxikiga.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/midesu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096301d64497---24262826565.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/9949901479.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160720bef09937---katefijazetaju.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fedutiteveweduw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4d4ac2d1---tidopetejozi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a09feab4d64---91716306162.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e8647902405cf856c5842cd255ecd747/sejomazotefufituzix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=traveling+through+a+wormholePDF 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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 17832 bytes
SHA-256: 822202a59c55e6f213936827a8f387d2e7dc8fac2d28f6e5c9fc54dede24ae9d
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 10600 bytes
SHA-256: 0124663015871b7702b3d36a5ec69997c44636457eee00bbf16ef521e7b78b2d
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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