Malicious PDF — malware analysis report

Static analysis result for SHA-256 689084eb58686fc9…

MALICIOUS

PDF

92.1 KB Created: 2021-07-30 21:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8150d6791737e473f8eefc266d209f82 SHA-1: a26735c318018046d72c499552608c74e7e5a445 SHA-256: 689084eb58686fc9140d0419483793bcf335262b96bba1f61abcadd8be1264c8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://drafthe.ru/uplcv?utm_term=math+textbook+grade+8+pdf+answers PDF link annotation
    • http://fullcolorspandoeken.nl/userfiles/file/bidisivanupapafusaju.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160edc5c92f5d1---bitiniwulixupeniminasakex.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effd199289b---2124171976.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/gubukava.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca941191e8---85182994794.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/65027861356.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b5c857b1---91763820813.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/witikul.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-8/20210608060052113897.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f1616083a74---majiwimukajonefuboborofug.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9118e600a---50309929744.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628737a831---69866142536.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50a2aa92e---31924037923.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3d3ccf1be8ae687d55a000792d8f9676/meboloj.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/75062979537.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/zezedoremexadir.pdfIn PDF document text
    • http://rc-modeller.se/images/file///96790038141.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/gelov.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/14098653458.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/wotuwipedeni.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/5900598207.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/vedikorabuvodaruv.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/ziburozupunuwezul.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/jimisotavisuriwef.pdfIn PDF document text
    • http://protok.pro/upload/files/97014225331.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_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 11260 bytes
SHA-256: d83f90fd83822f5a3af9dd98f5144113431fe2e8dc44eb1150edb4061b5d9fc6
font_01_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 16860 bytes
SHA-256: 17023a4890430743f32eaaae585a1ecacfd8d71ce1b6c0b8648434457c990cfa
font_02_sfnt_off0001491f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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