Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eb36d45d87de68…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 21:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52512f21f985318f0414a064b861c45b SHA-1: 1b7414075486bdd2f3eb7aaeb1158ce278631032 SHA-256: e5eb36d45d87de68eafec534d42d14b2b4096a9a46c4eb05d6db949e5c537879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URIs and the overall structure suggest an attempt to lure victims to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://evopizza.lt/ckfinder/userfiles/files/22179373725.pdf In PDF document text
    • https://finatwork.com/userfiles/file/nejubulaxemi.pdfIn PDF document text
    • https://norservis.com/files/files/juvibemajiliparedi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5236a20efaac2488a87d4f79577aa653/73986622534.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e459b3d51---gopusakijit.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/70366097456.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/lojisavunu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ee01b611---xikediwesex.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tagorodiraperagaxun.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/74344525345.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fawuremewasaluru.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/12843449202.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62aec1cb---domamamigin.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4e65d9c6---supugobopefovokemi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608607ac91714---60740284338.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/vubugomejidabojivu.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/74819840905.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0627e21ec---68894305774.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/sfr0dd043ncljfd7ugpgf8rcn6/54045232756.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210620_2D63AD2DE507C08E.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/povevig.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160724d4c3516d---92736801505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+reset+my+t95+android+boxPDF link annotation
    • https://forums.androidcentral.com/showthread.php?t=388855&s=77dc2f60ffe0c4851e848a20df496efaIn 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
    • https://forums.androidcentral.com/showthread.php?t=388855&s=77dc2f60ffe0c4851e848a20df496efaIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 2220 bytes
SHA-256: 23c2a2f102e766385272d3fa2cc38e720c07871e8eff2387b06c2e52b60ed29b
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 17816 bytes
SHA-256: dda68d72ac4aa04ed1e117a748981764adf86e0e53ccd62a304fce644b2a8497
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 11096 bytes
SHA-256: 1a1f698ffd52cbe2ef51d8753f48042de81b19e9ac88fa05d36957af50d6a57e
font_03_sfnt_off00013d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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