Malicious PDF — malware analysis report

Static analysis result for SHA-256 307840ace8a5f8d6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 06:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c1e8cb9ae560085b1d19fd20a0fda41 SHA-1: 2350f62b1f91589ed0045502bd01c9721d343d57 SHA-256: 307840ace8a5f8d6ebbbfe684608c1677be637d355f5348007c7d1281c24f3f6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://lifeline-sports.com/files/file/32997199589.pdf In PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/81456998296.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2qnrthet0k45sqlskqmob1j0jm/xofusewufudasorugij.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/werinituregox.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/13376657617.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210904120658.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b3290090---gilegipulozojajufatodub.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/93112273823.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/zubojuderefuf.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wurolujudonovu.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/24969984581.pdfIn PDF document text
    • http://chengzechem.com/upload/files/bixilesobev.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4077cab66bb26978d82bb58e965a40f0/82640831341.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43643399971.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/penomuraganopu.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/77934530227.pdfIn PDF document text
    • http://qdjshg.com/files/file/loseriwixijex.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/nedozovavodimitido.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/72283050972.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/35163539170.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/jupoveverunimafe.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fenanefukasosoto.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/gofawajituviti.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903123610.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/wesexuvevuvajajarolewe.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/porigape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sim+iremove+toolsPDF link annotation
    • 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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 16748 bytes
SHA-256: 9f1a32299b391ec911489c3c3b9df404417b806cc64b0a844dcef865c298d2b1
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 10144 bytes
SHA-256: 219bacfef55681cc6d8d7d0fdb9bbb9a1d57ffcd40a9de9c4d39f03226add148
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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