Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d357ecb8826409…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 10:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96eab61b3893539d3f6aa8a22bf77664 SHA-1: d1fcedde0a402efdd0525d2053ec5621338b575d SHA-256: 92d357ecb8826409a8662ebbf9866f8042b24792b793ae8f21a766a76bf70996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted, but the presence of external URIs and link farm characteristics indicates a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=best+way+to+increase+cardio+endurance PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e3c89f7d1---kovevur.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021100111480273499.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109031447293950.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/dukigefime.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1f898290e7aa8468d357ebbf933873f0/19161050191.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/53179063544.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/xosirazuz.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/46130180999.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/96411552469.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/niwulaloregoduxis.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/migolabipo.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/zisuwoxekofovivixuz.pdfIn PDF document text
    • http://17njl.com/userfiles/files/kuvitovokoramopitupanisuk.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/vodoxonij.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_230749.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/soroniburoxawakakezaluvep.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/60892400383.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/23937939385.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vezuxebowage.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161464520bfd8a---muxutevokisalewevu.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/87381268985.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c3f5f570---tigud.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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 15116 bytes
SHA-256: 8d0df81904b47b81f8c271f1d21a4ed008a244d637cec6113cc396cd3ca8e144
font_01_sfnt_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 10672 bytes
SHA-256: 00a8fc7ef7e08c659be18698c19046f43eaff8c1cb1c9b7b54e685103d570e96
font_02_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1