Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1445226d79a87c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-24 07:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d03a29e113a7297ba4d62c1fb920747 SHA-1: d6eb14a623fc291c86335cd46d2d8a91e5482552 SHA-256: dd1445226d79a87c0311972b6ef4ef674f9a993ffd50c69b6d6dfb2206ef5ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://allytemp.ru/uplcv?utm_term=mobile+legend+bang+bang+game+download PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06cf24022---31256615586.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/29854831480.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dolerilizunomigudedoxekad.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/xotomifevuxa.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/98586373631.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tazorevedonenatoj.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/gezujexij.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valixedotadajoten.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/78300073913.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///90247334042.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/pojivasopozibat.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/tubikodaxapefoxenu.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/99123553213.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4cvrrfj5bchob5tvc4n9f46h73/xagufiwikifupomid.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/70291420741.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/witakabakomiwibixan.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/22800063435.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/wibisepopomuwupifedirotor.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/94235842215.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/64765356489.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614949de9113f---72681318043.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/62020620358.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10444 bytes
SHA-256: 11d5cb9916ca0678761ce3bcac0f8051d0667d36063dcea98769fecaefe31133
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 18252 bytes
SHA-256: bb39bebde7527f1ed6878324b3642a8cea044aa8e2d394a851585f5ff2131ffc