Malicious PDF — malware analysis report

Static analysis result for SHA-256 498a795898d08d65…

MALICIOUS

PDF

89.6 KB Created: 2021-09-19 12:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73ec0fef79912f770fc25dfe5719d636 SHA-1: 9277da30c5d57221fa4a2c6fd67d98c17f96f2e1 SHA-256: 498a795898d08d65a9a9d55f0923689abc07a54acaad474e9cd3c1539c21fadc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coop-alternatives.fr/images/images/13264392402.pdf In PDF document text
    • http://dar-tom.pl/userfiles/file/narizoronawu.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/47446601485.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lelowax.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/14452134285.pdfIn PDF document text
    • http://irollee.com/userfiles/file/taguropedesolut.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/99974700712.pdfIn PDF document text
    • http://santeh.md/img/files/nozepuset.pdfIn PDF document text
    • http://santabruna.cl/upload/file/76579895411.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/93022903327.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xomukovelebax.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/74805392157.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/16813419073.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/816d0daf9b789e3a50898d09f664d9ff/konaviwogutujewopofilese.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83373337483.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/62026706605.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613230f458f5f---67401507891.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/wawitavomox.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/xinigi.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/jupat.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e439f0389b---68151687682.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/44965515705.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210916/0457365469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cricket+captain+game+download+mod+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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 10900 bytes
SHA-256: 10ad5b32c5ee4b5eda52813d92a5c7946dea13e1618239943ae946a09a70f710
font_01_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 18660 bytes
SHA-256: 879a5ea36e9f480d43038df984f2283e24fa06c22443596d0ecf5c23aae26e27
font_02_sfnt_off00013f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1