Malicious PDF — malware analysis report

Static analysis result for SHA-256 a269ffacdd04f1df…

MALICIOUS

PDF

99.6 KB Created: 2021-08-12 18:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ef2c92cd05169ae8b68216a144ef3c49 SHA-1: cc21374e33fcba05b8f1f50751dfcc861f052c3e SHA-256: a269ffacdd04f1df6dd1c1a3ed1393c176005a43776ba4d7fa123f855d410ba6
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vn6orbnkp8ek0id48lvljgsppo/5628118145.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ee0ddd4c53a89b8e7af5983119373038/wopered.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/ziraminixuzidudoguvebiki.pdfIn PDF document text
    • https://btegypt.com/file/zoris.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521092931645053.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/60892812273.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/29805263029.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/zikon.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qnc32kvr8piem2s2cjh59lm2ri/kirapusepoj.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/tivevuf.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/bunozugixovomago.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/levexuwopapuluvirogevibu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809cb3328d9---mekivogunaxurukumaduza.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/64495318748.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/56541173707.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bfb77b79---70709367818.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/65793624456.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/gunudopaxifu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e618ec5663c415761903332be6d7e075/zimowitotijuxor.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/32400560577.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc64f4c79ec245cf8780df4efc5b302a/99023964041.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/64109961433.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8c8fce19bbdb07ec0d166980eca24607/57234291823.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e8f4708f---83868028650.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad22097c0c---kubedet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+an+optifine+cape+for+free+1.8.9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 11012 bytes
SHA-256: 0eff6b5fa31701523bec2caaf712e0bbe38c1990243ad5bcf5d8a7fb236dd423
font_01_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 17920 bytes
SHA-256: 8a984a16f3b9e2ce06f7861b83e1a6115fbc685c725666cd4a06387722d7d3d0
font_02_sfnt_off00015029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15029 16124 bytes
SHA-256: 794b5a3a021b5b7a66f1f2a027c55b4116ac6db9b0d701468f01fb3bd658e09c
font_03_sfnt_off000165a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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