Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3dca1af4cbce7c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 04:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 407c4206dca831014c3686ca6a747a9a SHA-1: 2b19270b6eb9bd028f4a6dfd1614b177012c6fd7 SHA-256: 1c3dca1af4cbce7c4dd8d790c3406316a12b62baa2b626e777dff7b4d3b7d068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=plastic+bottle+bricks+pdf PDF link annotation
    • http://mevlanaasm.com/resimler/files/xopabadizavalakobumal.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266c0ad8d9---wimamenafuxinebojelojipo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f6d686ec9a569bc6c2a1cc3037ef7960/27704264302.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c114e42dc07---kogegavuvufogu.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/vipumidenozarov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0478f94c3f---9480417442.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/17267092713.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/78527564671.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/65467452329.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/4159571772.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/70906000840.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb547dcc2---44960271139.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/69938789758.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/nixurevere.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdfIn PDF document text
    • https://akconta.com/uploads/files/927548136.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/ranuwefabosubovebigujug.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/29677430008.pdfIn PDF document text
    • http://asustainable.com/global/file/bepotawimitelimad.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a088ffe2543898ad14c25769248d1335/95207378571.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127683b141---kugefuniwezopulosalawe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b97fbe244---77963832284.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c220cab0676d0ca33622ca5a2937c440/fazelobajotuninutinebinez.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e882a16750---47012875987.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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 17620 bytes
SHA-256: 91d67e8339239bcacac3f6093341ede304b2b44882d0c00cb691388261aca95e
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 10740 bytes
SHA-256: 1ced42d59f2f82e2f34cbb0ca1f6da9487bce6cdb10e67510961c0b8ed17c3f9

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