Malicious PDF — malware analysis report

Static analysis result for SHA-256 2174bf12a3005971…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 05:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 237db1d402f1e4d67efa5cd7e11c8f91 SHA-1: 2c31d6fc6ec7398199cd9209926f9e0241592d7f SHA-256: 2174bf12a300597121fefd31839c61c986855a338db8b56053607467a8262dfb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to manipulate search engine results or distribute malicious content. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://sage-chem.com/image/files/20210702_134409.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/kowenevidune.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/kawawetoras.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/222f648ee45982f99ff32ec6aeaf6661/pozoliw.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b89945b8908ff8b5611f54fedc7d86d2/mitakitavanusiwigofiseku.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/51550265890.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovcdobd9o8perag6ek7ltt97ll/44877335090.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/70869223936.pdfIn PDF document text
    • http://ingore.cn/upload/files/58126371554.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce2cbe650---57291276300.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/85660086012.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/jarutoxafubaguxe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f335c7ddd93ddcb31b34f27e85e56811/8231489420.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/rewadunetavazexik.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8168ba017e---28318257897.pdfIn PDF document text
    • http://praguetransfer.com/files/file/46851625396.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/87144896392.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/mudibowalakedazoxub.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/nenejuza.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3e1a03315688d40d0a527e9c0d734b99/nuvuzuno.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/94208837702.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a38baa75a4f39f7dd2ef222817c8bc82/dokudejubopezarasik.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bdmndggkmncvao6fq8dtleut6l/gaxixebapebojimomalimoda.pdfIn PDF document text
    • http://eichler-kammerer.de/gozirigawejamulevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+to+doc+mac+osPDF 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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 10164 bytes
SHA-256: 76bab88597573ad1ab74f6d45b595a43d71c5e62d870d9b0d12c1a34bab9b641
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 17140 bytes
SHA-256: 9813336dea247d248da6ced02b3dd7ae38e12d9c0d068fed814d8bbff1e9f40f

Open this report in the interactive analyzer, or submit your own file for analysis.