Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed3b48a602773b…

MALICIOUS

PDF

89.8 KB Created: 2021-08-22 03:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5aa72a2c80cfb10163f2bcf6a809d3b5 SHA-1: e8bda18d7e10a268e935d2938237f12da318b3be SHA-256: c8ed3b48a602773bf6192405c9c69de544ddc20cec6b11d613afd2272b8ecde7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and link farm indicators suggest the document's primary purpose is to redirect users to compromised or malicious websites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

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://medvor.ru/uplcv?utm_term=diary+of+a+wimpy+kid+hard+luck+accelerated+reader+test+answers PDF link annotation
    • http://abpaluso.com/upload/file/vuduwofiwuzaxigazeja.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9d703c0d0f2d1b01f2393db97dcfe6a/27347249024.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/54513206049.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tdpo0u07kuuvqgpt7o17clvmqi/81047957803.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610f617f7169f---23864211413.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/58425118533.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/newevekudajodiragaj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792153141a0---27939671579.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/92071447188.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4141c1904af540dc1eece64098661cb4/tewakigelil.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xiwanapisavuwigosujazom.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050106163481.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/93cb816538aa99c70a5e5e4d8d50086c/20402658441.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021716648224903.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/77680558871.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/45048978531.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/87415715825.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/kaxebunosasiwosenarokefos.pdfIn PDF document text
    • https://industriameccanica.it/file/26029198941.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/89102010161.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16075f59097921---simisukanuviwubuxewolad.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4658a678af7e9021b896f8f867b3caf0/6255670011.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/kidawuwirobufibamuf.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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 11280 bytes
SHA-256: 67b88e6eac0726637507a1f8a24c9fcd300b48a27364771cedbbd14c045015b9
font_02_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 18996 bytes
SHA-256: 8076bc6f12a5f097d3869b6743e0d01141b2f2246bb4dd8ae996a47d5ba1e1ab

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