Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e5cda8a299c568…

MALICIOUS

PDF

97.6 KB Created: 2021-07-03 03:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1c7b60f1dc247fc467bf6a1974f46a98 SHA-1: f473a52e51860ea010932d447aeef59ff614de98 SHA-256: b1e5cda8a299c56821b97a0c5d740f70b7dff062aecf4324d3c7552ce8be5de9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'utm_term' parameter in one URL indicates a lure related to downloading a 'Harvard Business Review' magazine PDF, likely to entice users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=harvard+business+review+magazine+free+pdf+download PDF link annotation
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/9aa2b22ad5151d055ccde94e92bf308a/zidozorojetisig.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jtf3gfdednqhogf1t5j2nsg56n/fozivevetawabemom.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f5ecb7af---68500741962.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48179c39---bemixaregolig.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lokawipuwafipi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b1a459411628fcaabb40c05ab833de14/80419124285.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8a713d86---turuboweravegige.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/muxikadipuro.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609483090c9b6---78872226307.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7ac480a4b96f604274081be99ecef176/86275979050.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m0gs40kenpsu1q31bpa7btrg51/wegibebalakuwamoluxib.pdfIn PDF document text
    • http://falerisztika.hu/tmp/47228462605.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1678269b2a---46451615315.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/pigadurixotimurezo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080999e98e41---1785217422.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd331d2070---gedotunulugamavidazuvabij.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/74307289672.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ab4dc085---61541073266.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/zoxowuresu.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/51412713965.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/vemupusulaki.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/74413298682.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/90442439871.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/68468973074.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/59882151990.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/duziwa.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_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 19736 bytes
SHA-256: b75e0b48c1095bfde274db046a9de70432f717384a0170a9a1021874f41cfbd5
font_02_sfnt_off00015edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDC 11184 bytes
SHA-256: 582761138f7025db0ca52aa9e4714d95b8b940491ae965c4c35857f16c23528d

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