Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f4c215cba0bdaa…

MALICIOUS

PDF

86.4 KB Created: 2021-08-10 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 174f935d41b3f60b3279fcd29befc237 SHA-1: ba9a94bbf78016cdeffecd533fe4773b618b279a SHA-256: 68f4c215cba0bdaa2fcb1d41b3646e115d74bcefd02642008424f18d42264299
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous unknown URLs, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the presence of many links point towards an attempt to lure users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://immobilgold.com/file/varimeduderadajotijoji.pdf In PDF document text
    • https://tanthueviet.vn/img_data/files/38502460668.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/tonudo.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/kelukikosaluxowusexuved.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/luwor.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210719_060703.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/98950151770.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/nakapi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/44464593147.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/dumaxasakovepovaj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc03a8c34---wekiw.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/89696487629.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/6998a18eacd394c0e5f3cb65a1292b1d/55246048241.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/jugorarora.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/83658233021.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f4548c1386a2f7bb9e4353f8227ec772/23748217059.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/delusitazelubo.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/42487016963.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e0dd808962703df0cf90c76abf82a23c/51875874665.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/28da260b3d2d26c1efce2480e958a78e/73945620541.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cfec4f44a980d74c8d73bb27292e5ec3/19444259672.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dopebimegezetix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=amr+diab+2020+album+dndnhaPDF 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
stream_006_off00011cc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CC1 25872 bytes
SHA-256: eb817a43823aa4e85c985a58bf5e11df204edaf0d54ddc7c1ece23d5c40a50e4
font_00_sfnt_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 10456 bytes
SHA-256: 3e982122d18102bda05a08f545a795fa16a8ab511c7eb85f376944b364893c3a
font_01_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 15180 bytes
SHA-256: d34f43c883f0695aa8019e8a8930f2f28fc3f4d5d9ce6260acaa749995ce59b5

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