Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0e53956313785f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 02:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b21f14a673241552f410af220f1462a SHA-1: e42aa77f4227bc2ada76f1781f402a1e416dda37 SHA-256: ab0e53956313785f94cff0bf5b282318a44fcfb3432cafb83c903f23e5b04256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and utilize UTM parameters suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it functions as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=download+hello+neighbour+android PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee21cde8f---bunivat.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/92046465260.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/togorikejuva.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/tubulidawawatawozojero.pdfIn PDF document text
    • http://ndt-ultratech.com/files/lekagozenunorezuni.pdfIn PDF document text
    • http://findacommodity.com/upload/file/dalefo.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/wulinudatatebaba.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144238e2feca---gatujizusilozuzixekixo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/zukejevuvebosezizezopa.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17053478004.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/rabivasanejedupetenetir.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/vedimutomujusefajagubiv.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/wuwotiligadam.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/53441663095.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0e1b0b06---41500513747.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/fubewuru.pdfIn PDF document text
    • http://air-con.ru/upload/files/49738280010.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613426c28a84a---rusewatus.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021912152735.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tabudokasejegipatizev.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141b437a34ba---paxosivunitukegibapipof.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/benamobu.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/45361183059.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/woluvubukobuvave.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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 10588 bytes
SHA-256: bee060d4d17acc7069599a7b748829a653aa7dd8c6d089360387e62ee22c0395
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 15108 bytes
SHA-256: c79944cd94ec3c7a2393e95f65f5d86b9d9517901de4aed4756d0ebd5662759e
font_02_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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