Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f70385de947308…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 00:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81753ee625aa3629c880511956defe6c SHA-1: bc46dacd95d9a1646ab7fdb564ff03725de8d4df SHA-256: 56f70385de947308553e5b6046eda9dc220927cf903e6aa316d0603b37a2b8c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ccfcf2104336ec71849d7a8111e19ca3/wiwuridifizu.pdf In PDF document text
    • http://ankamet.com/userfiles/file/zinameguzonenoso.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zivokopemevalegezafa.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210728084904.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b5945922---simutatirizanix.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/niwibi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/batanixugimofete.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7399a51d99---19670462656.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a248a1d5ee1---bosotifisekok.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210614_A011E0DE397408DC.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/39030323629.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7627791c54---92790342629.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/nalofiwir.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/50697787143.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561d07bfe0---78070297216.pdfIn PDF document text
    • https://geniodelweb.com/file/likojamupig.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/vaxaxazawavojelopizopoki.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16095ad8a70c33---karezenuzufuwafi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5fd7d1fe---fezafagakenaxomemobefaja.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/notonodadijudoweroz.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a5fd0e8f837dca7d24cea6825e5cd3a7/sebitosoroxigipagedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=does+kirito+die+in+alicizationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 2512 bytes
SHA-256: 2c61bf1820f4c44859e570ded78b71d1997682b5eb7c6e0630b5f95ca052afa5
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 17628 bytes
SHA-256: 228b8dcfa006c88fb4cd1e12b2238e4f17ae14d871e544183bb7f2b348308bb5
font_03_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 10516 bytes
SHA-256: 018f807760fa2983c24350acebdafb7183a7868d773c16af8b3691cc0c4b4237

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