Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca3fc81e8cfd73d…

MALICIOUS

PDF

80.7 KB Created: 2021-07-18 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aeaceca5ba258c9a8fc6114cace41cdd SHA-1: dd25a5be9823dee578018f3ffe3b73e9d1325747 SHA-256: 3ca3fc81e8cfd73ddaaf51913daef26636272cd2ea6dca3d10a8604cdca1eb6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to redirect users. The presence of multiple unknown URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35101034725.pdf In PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/razukudotuvojagadunopeda.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da6c4f1ad2e---81888573520.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073455f8c660---54135555904.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/19154583782.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/venulugazi.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/b6045fb758089f61c25ebbd6fc5341d6/60965101283.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/vogumokojeromadesam.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6acc76d5---jalogamoxumuvuzivez.pdfIn PDF document text
    • http://samtekelektrik.com/files/98606339629.pdfIn PDF document text
    • http://24cvety.ru/upload/files/58745054440.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8dd02b1fbf15648cc65d7ce92f298bc9/81917495662.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/liputotutafexetuditep.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/da700fc5ea62ccae715770292cc7cc17/39700072154.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/futudopige.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/49073529102.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/solozumadagi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad9a055bac---30469925725.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/napurukanul.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/tedelibusovimexamixituti.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/49641414025.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6daaeb3b2---zedufezuzux.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/5784973317.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86980baf62---sobifarixemoxivituwuzuxi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/q4pb4kt9ajl5a5q9nrbntctss7/xabowav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=number+one+chinese+lenox+villagePDF 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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16768 bytes
SHA-256: d49083335934f917500b53df646b1962b14338dfbc75de21531591dd0f37d145
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 10964 bytes
SHA-256: 03391b9beba2a9740469c43b970799df002c6f4be859563e4366f28562900d7b

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