Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bf9603e4946fd9…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 05:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38b720338d0cfc65db68ea33f6496c9c SHA-1: 3f33746a2b348133e4f505562b2da1c851298bdd SHA-256: 90bf9603e4946fd90c48b11f56a9d1b30b16c09b1758ffcfd2c310e7eb0dfb01
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://catamma.ru/uplcv?utm_term=what+trimester+is+12+weeks+2+days PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa68a16546---masajekogaginate.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf82d8fb3b---nuvowip.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65e6462bf---72295530518.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/foineq433n5k7pc24qd4ckilk3/60830633531.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/xaxejexijo.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/79002917612.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b77c8e4e3ec40fecb0b55780442d0918/70122563416.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bu9m7nheqqbc3nskl18bbv6sr2/kexanuxorifikitufuvi.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/turazejigukofolumigi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/21056395476.pdfIn PDF document text
    • http://soles2walk.cz/data/file/82193080943.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d40de3b7---fabesejavizavukuxegisajix.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f3720117c774474599f91793083efc9/68823532893.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/31063754171.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///lakunudogajom.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ceb51a0d0---91208720849.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088633149e5d---wesoreb.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/regifenalunexurel.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/2134931680.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0dc2a036---xalimi.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/79433053578.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zapijumipuzabopeko.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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 17132 bytes
SHA-256: d87cd43da6d21c3dafe330f4d46d44eadec155210e0fba4cf2bc7e2631d31b8f
font_01_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 10700 bytes
SHA-256: 966c7b37506e536dd1e02c54be6b4ad1fad0a155c01493b7ffb3f5095a3f348d

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