Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24a0c609ac323dd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 07:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9afe1d71edf24170a48236842cdcb76a SHA-1: d83782ba9e11545eac24592b1e15945d2de1bb57 SHA-256: a24a0c609ac323dd5e5855e4a0b0384fae7b13da437f21421b78d1fc48e9df7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://speculatio.in/userfiles/file/tiwaxukusodurubasuvenufaf.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/762e4dcd6b296f4a78e99ce756b2dba1/duvolosozuwitemero.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/kopopeweges.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/83413343365.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/33703964873.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84924123089.pdfIn PDF document text
    • http://budka39.ru/files/dapikebuxovulazexisakuga.pdfIn PDF document text
    • http://friulanapanini.com/images/file/kavoruvolekejoseduvowadi.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/zewexapanetovabuzi.pdfIn PDF document text
    • https://ibextrail.com/editor-images/52745084104.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/buwegu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/dogesaloxop.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/bobaralo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/ligosupugipufodufu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/83555537944.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3214c728---ravivuzefonabasafup.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161379341c14ff---jifiloxawuxi.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210905072419745178.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/bafadugusujomeloko.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/wikodikog.pdfIn PDF document text
    • http://gr-chem.com/upload/files/8125705394.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94633397589.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lekobogusabivewaz.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/rarexikopoxinedumegujodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+see+stories+from+private+accountsPDF 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_off0000be7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 18204 bytes
SHA-256: 450b5350ff18fcda30766b437ece9a4553950723b207342f76d97f5be86390e6
font_02_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10840 bytes
SHA-256: 054b582bb1e8b9a68c888cd420b2a2e964bf44249d5ce389f72c87472cce6fb9

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