Malicious PDF — malware analysis report

Static analysis result for SHA-256 106b92b26c761027…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 17:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ec1a698e0153ac51ef41b610d3d3962 SHA-1: 5d1ae2cc1a25f1d413924bd4d6aef41dcb182133 SHA-256: 106b92b26c761027b4730e1be211099d080c64e06222ff99992ce0563001c6dc
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised websites, and includes a visual download button lure. The presence of multiple external URIs and a link farm on disposable hosting suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://rustproofingottawa.com/userfiles/file/93157713427.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/vazufasovugupabi.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/xedowoxizodebilo.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/71334680139.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/37808206907.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/74522090981.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/10752613247.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dupemokuludedakivuxil.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/wegitulu.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36136805124.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/55165869060.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/roduzatarumago.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/serad.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/13567657907.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f5f830b8---niganefuvoruvi.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/mekudopirowizusubilebojok.pdfIn PDF document text
    • http://offerparts.com/upload/files/dibuzosibilezog.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sebozojuker.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/dusanufosagipelusimas.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/28390352152.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f5658f51be6e0a8bf894e231041ccff3/43745420718.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/88778976474.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210915184328.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5335e579---17202673504.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/70576939654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+kitkat+launcher+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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 19744 bytes
SHA-256: c1c979ef6dcaf4ce32600162374239f29624e922466a2ac517757ec4d8481478
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10616 bytes
SHA-256: d9e806d3ec73112a6bab1cfe0c26b143cb780f2c98a1009d3b323481b2e9d8f2