Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad73ac3ce5d79ca…

MALICIOUS

PDF

82.7 KB Created: 2021-08-05 12:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5373051419dcf0d84cf8bbbf08d4acdf SHA-1: 28ba47814093b42dd404a312877e0f569e4dd0b8 SHA-256: cad73ac3ce5d79cad901e914e76707dfba9408fe637393a8aa00187928c3cba4
164 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous links to external PDFs hosted on various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://boxerdapolenta.com/cmsimple/images/file/sifojojimubutaz.pdf In PDF document text
    • http://softtox.pl/new/userfiles/file/minujobis.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/40744555386.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/6627070237.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/32436765723.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/gosuxarug.pdfIn PDF document text
    • http://cocoal.com/uploads/file/51214363746.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1709d3ef8a5779b9a37dcca977279b69/19666753768.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210530075734330640372.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/fufonotiwoxemimidutegi.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/69894917012.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff77f3ad9---mufizepezegotalada.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090c86157f46---90188905573.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/661128774a29b14dc832844667809718/21507452465.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16103239d1eb1a---39868949362.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bb8cb45b---82549413530.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/78097617139.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dusubebixobobovoxevaxu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/zelipudo.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/18173041642.pdfIn PDF document text
    • http://ramayafaith.net/clients/64268/File/jikige.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/76331014858.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096a128d2a58---nepolefopozazemelemetuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+record+expense+journal+entryPDF 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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10936 bytes
SHA-256: b08cbd2620afe4b9e0f77d2349fe34b9313a45205d9616ce9e89b95ced49b64b
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 17668 bytes
SHA-256: 08d6ee0365d2e0da8ba70da5810ef4813697711891c2d6184660ae45cdaf0934
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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