Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd97b1ecaf9060b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 01:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36b2f4ebeed4a2da06eeca59a5c74102 SHA-1: ac444bc47aceccd8ec3a1391c6aac13770d5c4ce SHA-256: fdd97b1ecaf9060b639b9910689b5b575f4d328df132a1c8759d6496c206fa8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=what+is+the+role+of+calvin+cycle+in+photosynthesis PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a2f54b815---8653963034.pdfIn PDF document text
    • https://fallsplat.se/file/bunelolijarilesitotinak.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/3943175805.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f81f0fe65---xerapepufasobufenofomezo.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/30162927130.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lsl61juok96gofd88o3ufqbvpt/98528578287.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/wipisoles.pdfIn PDF document text
    • http://vanhacollection.com/images/files/lobejet.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1d457a3e---lupitanuk.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/93012426665.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/rateputesolopo.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/kutadepatodogefurubujem.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mvqdmar0im7dpmp6hnbhmj1skj/32731042486.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4d1ff67d7c465d84167671b38f4f413f/88461698067.pdfIn PDF document text
    • http://yanartextil.com/firma/files/wemesikaveroguzidasidebib.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3dffb3fefc72cae05202d2edbb478a4d/kesedebasasupikijemev.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16105ff15b23e1---55599564632.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/tapelaxiv.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/kitakukojejulufevuturig.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2bf644b78cf02b318658f443d502463f/91772514153.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/xeregekolinuwezoboregu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d83f9136186---pujido.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/71751543705.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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 17796 bytes
SHA-256: 8f40ff51a892b4f08260150446cfa88adedd975f2a32d0cc706644706fc87899
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10752 bytes
SHA-256: 6f0822b7af63ed5c68a79fb2f8d2699e2a4c532353cb3900f85e0528d2ba93c9
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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