Malicious PDF — malware analysis report

Static analysis result for SHA-256 90170e84a03fbeaa…

MALICIOUS

PDF

98.1 KB Created: 2021-08-04 07:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c18a8357f8207e2c8b0e12b85d34d9f4 SHA-1: f4b55c19c20c5841415786422bdc804fdf57a893 SHA-256: 90170e84a03fbeaa28e8815d2276d1348f1d1c8ec266f3e59e3f393f4c63a1c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The presence of these links suggests an attempt to lure users into downloading further malware, potentially via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/du1mk2su1o6q6mltq44p4apjeq/zasaziwefiguxo.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5680087a3534d693589187d5f071ad9a/93988097717.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c11aafca---28704561181.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/c8592679fe077caccfd098b343aa95b1/losaxikuxeri.pdfIn PDF document text
    • https://veljun-ldm.hr/files/82888812840.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/94603884843.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0438724db2---wafabekoradam.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/68520778370.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/piporedelakagesosobovisim.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bf17q993qe2o59hmdrrs5ci1c6/99202263717.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/47036105437.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66c6325c35---74766537415.pdfIn PDF document text
    • http://jsdarvin.com/files/burarobobexijef.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1t9jqbl42bim8i2mqn8aivsbhc/sekufujiwijolivol.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/91969226366.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f755968e88---dugopikonokogobobe.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/218451df9db468dcc501342ba734d3bf/41255246103.pdfIn PDF document text
    • http://klefmarken.se/upload/file/duzabefefufikexaxakuv.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nutonarerod.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f272717c7f5---22557326843.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/64934761221.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93a0b25951---62348807592.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/37296597447.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/58143867052.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/66983285257.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a9f2ab7b---30165571453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cbse+class+10+english+grammar+practice+with+answers+2021PDF 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_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 17648 bytes
SHA-256: 851554d5cbed35687d27f5a1ffc06e95151fad983a123ade366ca90ea532172c
font_01_sfnt_off0001460c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E23 11252 bytes
SHA-256: 12feb728c6859dcc219297c48199b105ef11cfabd0d37a22b992a2a8dd7b6803

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