Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa667f6b4bbb3d0…

MALICIOUS

PDF

85.2 KB Created: 2021-08-12 21:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d365189bed26149a12ddd671bdb5f24 SHA-1: 58e5a7d74bdc2b90fb3e5861d1a884aa07b2e2b5 SHA-256: aaa667f6b4bbb3d0e083fcf39b43af313a85c3030a62c40c9e1f64d399287d55
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous disposable or compromised domains, suggesting an attempt to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=guia+de+consejo+tecnico+escolar+cuarta+sesion+ordinaria+2020 PDF link annotation
    • http://starsunited.at/upload/files/terolupizupox.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b24bacb921c---kunozavisepefatozoz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/327133b137dbaa607a64a06e44b762f2/wazevotabil.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/vifugokunimadewaro.pdfIn PDF document text
    • http://orthopediedelft.eu/files/79206863730.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793a9766ecd---39839014791.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf0aa3e26---41458032579.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81baf853e8de1584b2f80086d46f97bd/26050636061.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210605211812.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160840f0208f34---pigixemadaxidilunigad.pdfIn PDF document text
    • http://gugugroup.com/userfiles/bakope.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zanizu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b25dd069b3e31bd7494dc0b3636ab5e6/27058732269.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607add137e30c---80718551149.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c71ac6e15---vurogik.pdfIn PDF document text
    • https://deepex.hu/hirek/files/27350648522.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/964c5bea11293c966980be20327a4672/84633624397.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zerijitiboribinijolap.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa715f7c5---mutefuxerigiralubufiz.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pufaguze.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f99368bb687a615119ce75d6b57fe37/98488129695.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828d115f68e---59625470590.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/tugebepunalesi.pdfIn PDF document text
    • 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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 10876 bytes
SHA-256: b2e7d4fadad645247a7d8875960bec4691c126963f8af7038891961ab7df45b2
font_02_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 18732 bytes
SHA-256: 2df7da6615c9396687533bca162ec1e43fcbe10aedbd78a5b58f8f0eadb328c8

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