Malicious PDF — malware analysis report

Static analysis result for SHA-256 a914ff1b1048a480…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 17:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7833aee3a1e9638022142e18497e7f8d SHA-1: bf54f4a179c94962c00059a1d323ae7e214e090a SHA-256: a914ff1b1048a4806d2382e7c7bf2c7f695889e5c9581aa1bbf90df10a4b21ad
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an effort to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d8a509360---83708387519.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e6kvgvm1si96trh56d40q66415/xulesojalit.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38d0f3ac0---suguguribebupirulugujori.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/jogumufijadaropemika.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/kesekefajajoj.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612199c1ec5fa---90103618886.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181a12349d---suwamaxuvebakewumeve.pdfIn PDF document text
    • http://aimic.com/userfiles/file/66408610185.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pkfoeoeeocte7pfk6v1vkkjd92/31974899017.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c78139b93---botezovusozufevi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/02f14400bca7229514dff35292edb810/gudutaleseraj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/35a09eabcc81e7b6733160c80b132b42/37545100445.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/7686361303.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/26936711625.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161109d5ab7c6e---74777207718.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l4bu4ag4njnav9h0a7ehicam6c/70689001434.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/97424672233.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/rujukozutisaruled.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab0fe4101---vozez.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/pewexenexelowevitusajufo.pdfIn PDF document text
    • http://gistys.com/userfiles/file/tusuxuromalazomapifu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b4024b3e---nirorijajetekuladovanin.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/05bc17433260e86b3df5fac5846db5d6/tamulexan.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/tutajasavilofab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+de+maquina+de+coser+toyota+eco+15+cbPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 20272 bytes
SHA-256: a4bd25441eb3b7181b7172d6d9b08c6038c22b566ad4e6dd67736663ca14938b
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 11208 bytes
SHA-256: b476bae5b82ef7cbc3bdd0ac55c8bc6be45a7666b0454e4cf0c7aac824d382d4