Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b290a391fed53…

MALICIOUS

PDF

103.2 KB Created: 2021-07-15 09:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 246121e498f5a790cd0902717b8042f2 SHA-1: 91064ae6cf196469d1ff57fd542f216a724bbd41 SHA-256: 951b290a391fed53fe249cfd21cef8bc73af5a5fa5bbc4f1d15d7bef1c8e30b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of multiple external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079772def2af---jidobijikegudositazexe.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1f98f705a89d11478c411e2cf46592a9/junomupalol.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/53973942802.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/pigujobufixodaforopoko.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8938410a15c43c0970dbc97e2fa40978/sepik.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad242416811---16085274951.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/9266988877.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/vujurekusimevajituzatitif.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/67068346260.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/44948901805.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca54a424404---7976975541.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zenevopewabaridodebinovoj.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fa25e05295352bc1917371281a0e0303/matedu.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/32068883936.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/um9rcc0p0dqnjpm7l06n053432/96949713700.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/98082398535.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rosesozix.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5f1p7t4bmbs10h7bsg89ag2gq5/24034432174.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab0588bac---lovugobimexaxoruso.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tvv8ptslcf685uqca60n086u56/somisokik.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/47497799589.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/33737211647.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f94b896915e7070a1dedeb0038740ca4/masaxipabibeva.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52480cb11---jezivejod.pdfIn PDF document text
    • https://ksboutlet.com/file/files/70567970579.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/jawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=6th+book+of+old+testamentPDF 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_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 18644 bytes
SHA-256: 9a86bdec2252405cc2450822f45fd43eb3eb324cdf53a49995cb3b9ae277c0c6
font_02_sfnt_off000175b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B0 10732 bytes
SHA-256: 1f04755d5531b35da9e244594b022fc91e84ceaf7fa931b36da14f8f887380ce

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