Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32dec293b2acd34…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 12:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab5009455f9742002f0b89f599574933 SHA-1: b9914f16413be9d26f28bd6d31980e8ea993c421 SHA-256: d32dec293b2acd3469f790bc33502a0bbcdbde21acc371f3e16b93bf88440f32
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hanmih.com/userfiles/file/20210908041507.pdf In PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/bedojezirudifeg.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/kilafexelub.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997c120f41---mavibako.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335f93e7a16---48170885100.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b79bce6bee37f5352604c7fa70d09c3d/zerafe.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/tujikimixosexogoki.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/vefafimulixabajegarusi.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/vatuxozefisipebolu.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/86294558568.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fpvlktff9m9n2ndbqnjvecvlfg/samivajenereko.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/45239172926.pdfIn PDF document text
    • http://www.agot.pl/upload/file/sejugifubur.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/77210874634.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/62082596792.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/74525628695.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/48387279582.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/30750196276.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/25951128724.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/9833449369.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/67215333654.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/sovirixapolaz.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ruxemegirufupotiw.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/77620486420.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/21253742485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+1+iosPDF 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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16716 bytes
SHA-256: 6123e526a3625c8c0ab53838994498744e18a18d6a5e730c21a9fea0ff265ca2
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 9808 bytes
SHA-256: fa75effa283ae4acd3c3e349ba3da87b4ea8a9f2968e39f784985270b2647b9b
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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