Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b14213793df0aa…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 16:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff8ddb1419d53eb346db0e0e90401e3a SHA-1: 7df3a63e4acd5d4262a0f2f46e8275408d2bcbc4 SHA-256: c1b14213793df0aa72f58d18deb82188b3ff81e7e645a795ede347921362024e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+install+ubuntu+in+android+mobile PDF link annotation
    • https://at1-turbo-j3t.com/contents/files/93595605852.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/rasuxomajiwigen.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/59883098714.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/dovejuvuju.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/92716948794.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2832f20d304b94d98c8d4266b2f582a5/16763390935.pdfIn PDF document text
    • http://esen.life/userfiles/file/muromagawijitiva.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/57888282072.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/79214061367.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/67155030606.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/milokuzigoxataxu.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/93982656356.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/57264402239.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd3a91bf6---7176120075.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/27181375359.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138551143cf9---nonovuxodu.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/tudavepodiwuviwojowew.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf8f514bb---63687164512.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/fuxisoguzizusa.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/57153904637.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/basafi.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/32375418640.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-3/20210903195137512731.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 18372 bytes
SHA-256: d7dbc5961071ba0e2e3c6b3a06c32542e8a0d1222163b55808ccdbc826fdef2f
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10724 bytes
SHA-256: 816719c1776d0dc1f7a860a61c1bdf4c7ac654efdad8a06167993ed66b5f7d2e
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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