Malicious PDF — malware analysis report

Static analysis result for SHA-256 df85a9f14e9db00d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 17:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0187f6830eea8f09089a41193ee4881a SHA-1: 739d1a1ef7857c53cdae67ebd78ef7a539646248 SHA-256: df85a9f14e9db00deb19ba2f5ae3bd52e67bad5516c909b262b831d9ec5c5af8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malware or visiting phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/62bdf3d170e7ceb6e2d444ad86b131ff/43459738843.pdf In PDF document text
    • http://letresorellebio.it/userfiles/files/bivejarigivefubigilu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/rapidatasulebemugodan.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f348e0bf34---37879811809.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165c696bd1f---filanipelelakego.pdfIn PDF document text
    • http://ccshecea.org/upload/files/95748759650.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/41vk8k5vurp9fgrilaouer7kau/redotiluz.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210621155453_nkipdm.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/n5ug7e8mbdcj6qn0vl0n49790s/lexabijakovejunara.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/gunerezezogar.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/duboxife.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/df4747d581163a7a456fe8abae3ce821/94359481911.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/97537941626.pdfIn PDF document text
    • https://flyags.com/editorResources/file///40609023021.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/01a6d5d467ccf2bbec45dee294003d0a/medoneragikuba.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/55083432948.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76b153f51---kizekebonemomogutazo.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d129168206---99828286494.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/80233963254.pdfIn PDF document text
    • https://andrejc.si/files/file/sawobidek.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12ffc8a09---5876318415.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8fef36e2bd8f7fce67e4d746552f0c10/64987064297.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b37e1c0509c5fdb24b95468a93eb4efa/18872209445.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a315de4c---64175315039.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nafiwitixeniredamuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=coldplay+clocks+piano+notes+pdfPDF 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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 10748 bytes
SHA-256: 019326c471a4380547281a50978f839f25bedde39d83927d48daf0df8ae1794e
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 17660 bytes
SHA-256: d99a1b5424f109e417df0bbb77a61323e02a9079cb4f4626b87f64e6f539f657
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1