Malicious PDF — malware analysis report

Static analysis result for SHA-256 3988d518cb7a1ada…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 17:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c1002b2761f5bf41e17afd33fc3bcea SHA-1: e82f1ba53b241e99c54516f3d4f50668fca6d66b SHA-256: 3988d518cb7a1ada87f3571ade7cf4cf3a430c4feabeac302e7dc999cb748bb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, many of which are PDFs. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/91304259b933b5174a37d0467461dd6a/nelopu.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba399f1eb5b---logabumowimaja.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c7c6a42e8eb218c668874c4df79aa106/28116749186.pdfIn PDF document text
    • http://partnercable.hu/files/36981951808.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/41693389486.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jekawowitamewakuwokiwonem.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d977b2f539---kifakefom.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98259cc54---79972103977.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202108132328182927.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gemewebalasimiz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d001d1716c---40345026891.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9f969c42---refekelakebus.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89727906937.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219bbe65a55---palavumewisolozafigukexab.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0161181001622360610.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e7b257b822943127216d22da19822eac/lojonewemerupixesexutebev.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf81638d3---garovesakafesufevu.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210811_7323F4B3FE69998F.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/gibinog.pdfIn PDF document text
    • https://avenue102.com/uploads/file/45096915142.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161125b61ea1d2---xusepigutesalelefifisaxa.pdfIn PDF document text
    • https://people11people.gr/uploads/File/pigebonutubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+genomics+arthur+lesk+pdf+free+downloadPDF 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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 11296 bytes
SHA-256: ac8493314469831a6ff9375f4dd1fec740603d8a5029108ab403521a5a0c56de
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16652 bytes
SHA-256: b5fc18ea7375467d7f7e161de3ee8a02ebe2933abd4feadd673062d56483a8b3
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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