Malicious PDF — malware analysis report

Static analysis result for SHA-256 0815642ba62adf72…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 07:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92f538b1ef63a9019bdf5adff44b3fd7 SHA-1: 4adc5cf6b7cb70da6a642085de64994015b0015c SHA-256: 0815642ba62adf72bacc5b0c504c11465ac0b78e4054f42594ddb30bc29591f1
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and contains heuristics indicating it is a link farm designed to host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the nature of the URLs and the lure heuristic point towards a social engineering attack, likely involving JavaScript to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://antichigelsi.it/userfiles/files/jawakapixuzek.pdf In PDF document text
    • http://hytechplus.com/userfiles/file/3761666915.pdfIn PDF document text
    • http://rcot.by/pics/files/tarukoximotebikafubesumi.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/46452015292.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/dizuxujike.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/30659931475.pdfIn PDF document text
    • http://vln.nl/files/file/74301047675.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210903_7E7D78C141554D4A.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/linufekifeketipa.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/lapuweza.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40ae64e4---94849279133.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/dd882d4785af2f2474d0f8520087ae56/kenevizuropof.pdfIn PDF document text
    • https://gdaniec.com/upload/files/nunebaxividef.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e969f44---mepafufujadalumazokukito.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9160194eb45693783dfa064dc415a50/jajedamosusopitunoture.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/63392804221.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109080950415238.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/karifosugewinorinixe.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pomalopimewobafe.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/34241291332.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/ranewipisadorobejomez.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/17197928262.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/dopuker.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/kamubitorobabukiji.pdfIn PDF document text
    • http://zl369.net/userfiles/file/95744033226.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/vokuxosofetesuxolanufowul.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/fawozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shortcut+for+incognito+modePDF 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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 18448 bytes
SHA-256: 86189fd087d40f2adb3112d235c831a4562ffefc8c0c7d1fe6332db1c9c716bc
font_02_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 10724 bytes
SHA-256: 2e34d74dfe726b1911ae0cbe738defd1188fee1374f254b133fb5059d8657f05

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