Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b534f1f23426a45…

MALICIOUS

PDF

83.9 KB Created: 2021-07-19 04:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 407288c3c41db623d92586ea2ecb001a SHA-1: 30dde05e359d3e0fd11cb56d692507eef49e9121 SHA-256: 7b534f1f23426a45430ca57ea52d794422bd6b8cd813237348542cf40b385e97
172 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, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the presence of urgency language and download button lures suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://czpohledavky.cz/userfiles/files/xavinevutaxo.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0756bd059---juwunedu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/50786143338.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/46257973671.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6d6e231c---37408780028.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lowusejura.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/58321982543.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/24168985412.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/93751683791.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/wimenejufokum.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/82205632385.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4aa0151a5a33377fbd344f040d81b3a3/22308518438.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e93b1f5a23d24faf333ce28cb5f4d8be/28886395127.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098d774f30d2---dipugekoxukufi.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/jivosinikiwug.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c91e6cc5a72d38ad3e29d152ed4dfbc9/37310076231.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4783743f---gawuwupazutunim.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ddafd6adea86cdc793c016ff3e9a462f/63368937848.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073243f4f71c---60449670698.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4ff548b589544f571d49589bd0b29d58/zadelozivinajawukoruza.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0542dbf23---serowake.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/bozivadusebizemogalu.pdfIn PDF document text
    • https://wecareprogram.org/images/file/96272804358.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pigawosisexerafapawabuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=boogie+guitar+lessonPDF 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_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 10436 bytes
SHA-256: 7ef1a6cd9b945c84847196382f7ea08f553d70c16ddfe41e6a437c278ea18ce7
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 18464 bytes
SHA-256: ca194617ec0c60467be8714ec5eb67e4581ee0521f09202ea4ba4cbefba5c968
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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