Malicious PDF — malware analysis report

Static analysis result for SHA-256 b686a2bbf2832602…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 01:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a0ef2937ecaf3044aae2fe49304b908 SHA-1: 37aa71364907d9cd804f1e480ca6bfb0450ef813 SHA-256: b686a2bbf283260280ba3f11697cf053aa64dc8ef9b10ac7e7dc7c9c1a956ff9
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The primary goal appears to be tricking the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=automating+with+simatic+s7+300+inside+tia+portal+pdf PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7vk7k1ainnk93efm8bh3b4s682/341454787.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/215373229.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/58766913102.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kidixadasenibokareruwitu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6d281fe3---86729400433.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/fanonimavomefiso.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/53493492533.pdfIn PDF document text
    • https://termofriz.rs//files/vosuzuvuledubi.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/11411347167.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ritevale.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f7d501d87---xisodimokutenuvumen.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb300237---wovemobebodozetoxed.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zuxulalevuni.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11341214419.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/5631516857.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/6fee4987600f30a96742973c471c260b/tezetapoki.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/24030759654.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/21539587120.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b541b348e75acedcac5e9a0f6e85bd7a/82162838773.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/34350997317.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e9711fe7---ruboti.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/54561814152.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa785c2d06b---viwotisuzizumofubek.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b5ifc2se2faole1pq3r5nc78s7/40534120108.pdfIn PDF document text
    • http://strandedtattoo.net/file/77130239893.pdfIn PDF document text
    • 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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 16716 bytes
SHA-256: 70d489e528c4c7d9c8550a2680b97398eacaf3e07f4b98c0ef094db2863a4094
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 11580 bytes
SHA-256: 675ddcddaaf4cfaa447e9864c9c3439fa76f05db604bcd442652c5c8b3842d47

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