Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efebd5807c0f369…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 05:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62abd746516b628a24f9468cc5e699f1 SHA-1: 8e50e8a7f15c884e312a35e607323ae187c3b81c SHA-256: 5efebd5807c0f369becc25e14ffa33bdca5c4d8a4f80e34184029552d669fc75
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to potentially compromised websites, indicating a phishing or malware distribution attempt. The presence of a link farm on disposable hosting and a link pointing to a WordPress upload directory further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://auxerretv.com/content/public/file/guvimifoz.pdf In PDF document text
    • http://itcck.org/upload/editor/file/fegetiwomixovemosifidire.pdfIn PDF document text
    • https://cakkue.com/contents/files/votibagufopuxakux.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210911223636125.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58735650155.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zigutegibe.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/34359739584.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/xolifekikovikefejepefana.pdfIn PDF document text
    • https://digireg.cn/upload/17253076645.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/kowomufal.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/58185221352.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/17703502617.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/15795405092.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/75377058264.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/zudomotajawalawejig.pdfIn PDF document text
    • http://balalajka.nu/media/48372307299.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae0e0c6d1---83164770349.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zasagi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/tefogokifubi.pdfIn PDF document text
    • https://heyratacademy.ir/file/fedupiliba.pdfIn PDF document text
    • http://generoussecurity.com/uploads/75902788810.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/46d0589a2c066c329291d557c7fd1d82/dejisexixijipog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f496878a34---dowulaganugif.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/puzikikumusumuro.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/87636181381.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kifejokabakelapupot.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/13412387821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=helo+app+download+apkPDF 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 17480 bytes
SHA-256: f3237c290b7c77189e7fa6177d0f9a615e567c169e73151f451305fab9aa15ba
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 10096 bytes
SHA-256: f6ad04af94a65c0f609a5c231e765a321f4aecbbfe2678c4d328462bb10c6d0e
font_02_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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