Malicious PDF — malware analysis report

Static analysis result for SHA-256 0810817ad511e592…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 10:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c80cecb5d798bcfd30f1b41ed1f5fe76 SHA-1: d9d98596665295bd7928836c81939725965b4fc1 SHA-256: 0810817ad511e592c5f1bb7996f87b8990f82e132f2d14e2a55534b50f2e86b0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the primary purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://bptramptour.pl/files/file/49611890502.pdf In PDF document text
    • https://pmsp-me.com/userfiles/files/nagujafefonefu.pdfIn PDF document text
    • https://leeleather.net/userfiles/file/bubidilujexakelorefe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f3bfb312a6b42a881252bdf3ff2539e8/wojewevugu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092314020820550.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/312539569.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/632519d1f3b706f6a8f7dea5586d3ac7/gudositegowomefape.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf979992bc---252857077.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/rataxavamoruvuviluluzor.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1e6550600726e1813e5651c2887ca6fe/napiliganuriwudotegiweju.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/bukitutadamewid.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b5f1b26bbce3e6c94fc97dec9472891/49106834532.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51e1189af---40446332648.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/laxedudawezokigolowi.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/tiforamoxiwazotemu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57980000483.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/zemizegoraleguz.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/divalemawaxopepafozuk.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/kaxolef.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jadup.pdfIn PDF document text
    • https://akemi.ro/hirek/file/36402108827.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/dufasipuwuxufazesiba.pdfIn PDF document text
    • http://atrsara.ir/resource/files/gokalibanebudojodan.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/pubanijowokitalazok.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/jabikefijuzulupeval.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/5518013269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vivacut+pro+apk+modPDF 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_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 17480 bytes
SHA-256: 9521cf673cc47b504ad0eba090b276b2152bd1988ffddb513c66e219eca329fd
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 10452 bytes
SHA-256: 3338910a94e7c83a8144c45845a5f30f018303c9c0494341fd66d636377a1e79
font_02_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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