Malicious PDF — malware analysis report

Static analysis result for SHA-256 06908df29bdd3d86…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 13:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1381be159fff3cf18546843a931fa59e SHA-1: 0832016d808a1f5ed756f1dcf4f65872d0132b53 SHA-256: 06908df29bdd3d86786426bf1c5c522e1046367386b41e40a8ef8dfea2b5e193
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 WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/2bd7097eb946a0a3516d6954c2eb7609/kexul.pdf In PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zawokakuladejage.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8285adc6d1b180a83a97ff1e4cf5fee0/73610142893.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/57e0f994e5c71a628391db3601188a3f/11544675926.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/vosamerotipasal.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/40052097492.pdfIn PDF document text
    • https://serka.com/serka/upload/files/77639047418.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tuzatowodozu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0575817c---vuritavep.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zidur.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/55157082533.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/72813571082.pdfIn PDF document text
    • http://fivelscope.net/fckimages/vimogekekoxowupuxovuzun.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/19132805253.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sdjdvu9p45ta2c2jl2qocd64n0/witebeg.pdfIn PDF document text
    • https://dom-titan.rs/files/52258310637.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kitefoxuwuwiwololimadul.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/12466849989.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/sakekukaju.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/bugojixazavifik.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/25093336017.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/96109658449.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vudaviwilolipugu.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/wulalugetegalezapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+a+call+on+facetime+on+ipadPDF 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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 17164 bytes
SHA-256: 6c8d7d6aaecd72aeea0c652c8543f676f03cf2f05ecc787e0544fdf9c8f7a689
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10680 bytes
SHA-256: e514ddd6d2a233b8e42a4103512da9286524e25ff3dc30926d2a17896ef0ea70

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