Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d5e00a9618bdf2…

MALICIOUS

PDF

89.0 KB Created: 2021-07-31 03:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 282f5e58b4dd619bbff9f2a1c9475b1b SHA-1: bcc3b3c24fa43ae131e09e99a4a0fddf776af164 SHA-256: f2d5e00a9618bdf23b6129a4ea2fb4b053e30ada10f676308b85bdcd7e0efc76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=what+are+the+weaknesses+of+psychoanalytic+theory PDF link annotation
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160740efa154c4---61864002402.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/zagono.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098eca2cdcb5---goruzuvivivan.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/98988982509.pdfIn PDF document text
    • https://bataretak.com/img/files/file/46800465348.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210717_0A4998A53EF39442.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lefosidipizaxi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d5b436df---jinozamowaz.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lisaxiguzupogur.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/minafotesevuwenip.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/68580226347.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/m8g8j6ueqktnn1gtv7frg1s6s1/konugegowitidugubibu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a4524d6f---liguboritum.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/64eae0793f7610420197ec05fff4bb2b/80064517913.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/dukeni.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ad7bcf6---mudaxukoz.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/91487453582.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/07pubimcev4loj7kld306je8s8/52948556165.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/1973528124.pdfIn PDF document text
    • http://klpa.net/userData/board/file/84122650670.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/52748079528.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/82718408210.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/k95n73s8ffckccgbpfcisq3185/doruzonifumipesi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c3cd5bb6---luxoletogagadidud.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d2461f4b---76166706421.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_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 16448 bytes
SHA-256: 5e8779ff462ba057df4b4a2622d65a10f53938110be2aa78f9793ee745de64bd
font_01_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10860 bytes
SHA-256: f77ee720ec9f4c2fd933584f3f99b1ea863edc383730ffd0540261e352619771
font_02_sfnt_off00013c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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