Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffecf34346e9e9a4…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 13:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 321dbd78c8f2d5b467dc04d6108d737d SHA-1: 4e5d433165066f839e00a14592c4b4d02fdacc53 SHA-256: ffecf34346e9e9a48d803248152876e358f190890fec67b0b2ab71888bc30c1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of this PDF, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=windows+server+2016+guide+pdf PDF link annotation
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/194d51d1c2b9f400c1c498fe2a22d87b/84905519346.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c593c67139dc6b14c58017220aef17e7/33378617354.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2f01a678da26382ae3e8d724af571c24/lategedulojigemafe.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/29854834663.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/zikemarenixemavu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/78087382417.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/15103865543.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd2f8d1fc---77593788108.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/85963270502.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea97bdab680e05c5ad9243a1ba368465/75622639716.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/tiwikolifogotibirokufuk.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b171d3ca678---nagekitanelupetabasu.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/3892951309.pdfIn PDF document text
    • http://bjjiffy.com/upload/kobofixojojogun.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111b8294c384---42245143504.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074752dcb1e5---78350949377.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eebea93555---seregujorixemopetik.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bac19874---4230184756.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mudajosunixagolosubis.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/64459831080.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/10656571061.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/61207583583.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e1a7977f76b365cee63d452cae919d29/83237975978.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b3e5be789da28f1bf2afb39795d8a921/18160257793.pdfIn PDF document text
    • http://adveotec.com/img/file/zasuxo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c061d3a6848844a5f975cf084d5ad06/19494884996.pdfIn 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_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 11076 bytes
SHA-256: 7a224ee68aa7cb55e7787f1d58561fe364fecff2a874d6701395a6f68d039afa
font_01_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 17496 bytes
SHA-256: 2c6fd36745f5739a636f13e45b8f432b92599409190b5f7c29738af9dfd560aa
font_02_sfnt_off0001563b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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