Malicious PDF — malware analysis report

Static analysis result for SHA-256 9854e836ae29d6f0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9eb9e24b47f5025dc9ac632f0d61b3d6 SHA-1: d1ed045f1e331e46c3b541a1909ec93a03137e12 SHA-256: 9854e836ae29d6f0a82e31d9eeb335258dcf56c3a218b9dd6c1c1fd4bc195624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://argumentua.com/i/file/28702350985.pdf In PDF document text
    • http://sungsam.net/userData/board/file/juvinajabobifun.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608051b4c1916---fobod.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/58551669861.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/fuzuduzegamobivi.pdfIn PDF document text
    • http://unityproductions.com/upload/files/38100290170.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/rulawusadadu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/23308725527.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cba040eefeb91eb74a246bcc96cbe20c/40672214465.pdfIn PDF document text
    • https://dineflon.com//files/xelawaxekulujaz.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/zumikibu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ebfea855bceb5d9a1e77f1bb9570a0b3/85033506919.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/65304943814.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ac1a6d85---38734867006.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/39791370193.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/55067772364.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/gogipositegotajep.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/56391526153.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27338a42b0---mufuzufaw.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a78c5f52f---71315295373.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/23206925535.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/gifafexa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c45878747f0---dizomemetekegejejuberasuw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d68fbc0a186---wogotipasep.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2242bfec147fa4cfd1368fd7aaaf31fc/24604862128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=survey+jewett+physics+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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10856 bytes
SHA-256: b818b45c45818928c2f739d95791da4d92c99b9beacb59f7454961b340809f90
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 19988 bytes
SHA-256: f5c1c4db90b9dcf9bf1ecd846d63b9b48317a5da7440db4c948aa8e99fad5a94
font_02_sfnt_off00012774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1