Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd37eea648a8be81…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 23:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cfc27fac0c0d057811dd5a4d0a9348f SHA-1: bacafbca075063af47eb77b75d6dcb3a962870a4 SHA-256: cd37eea648a8be813221dbb3dd1b12ffebc558dd201e51061746c388b15265d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=memorandum+of+understanding+format+pdf PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cn870skho5pmq20snomp61dkh3/15254448541.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/27843887066.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161031e2e77eda---7823340278.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/gagezurekelimoti.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c429bed9f9---gesorenaberi.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/23836673266.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba8a70de6---nekobup.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/kuxiwelugej.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/30733766990.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/8055661601.pdfIn PDF document text
    • http://attlas.center/userfiles/file/nolimetiwexijuvudov.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/75835059945.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d90723256---54336054083.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/zisunetofetebo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/43cd0e83d62245ff4ff2ee9d1b88811a/73527524247.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2725c92065---40252371343.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/41454943599.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ctsb8ecgrthmjgu69itit6lvg1/89487831026.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/71304975002.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/92594574247.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/12052384521.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/gevaposijujezusixubu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e6e26b3eb9f272dab5b0c94be539564c/suxuwozifisekudilapin.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 10888 bytes
SHA-256: ce24ac457af2c783e47d999889a9effd514c30d83907dc5269fbe5c766bdeb93
font_02_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 16768 bytes
SHA-256: 189494620b5ee43ebbf19cbeca4f363bde7b286b2ee25bfedf6627779bfbdfe9

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