Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c4ab3289fe5c8d…

MALICIOUS

PDF

98.1 KB Created: 2021-08-12 10:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ddf3a802d767134f92e15afff3bb5ba1 SHA-1: 5f65358d33963798c6544741ac9863731806923b SHA-256: d5c4ab3289fe5c8d236e59b9e5765722d35b619aabd1220241b718335ecdd529
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and embedded URLs suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4907904e6---7519059425.pdf In PDF document text
    • https://bmw-zona.ru/uploads/file/sexerefemezimu.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/korojoxodulaguminireros.pdfIn PDF document text
    • http://chapelguild.com/images/usr/87466172606.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/969436294.pdfIn PDF document text
    • http://flexicourse.cz/res/file/70999418909.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc84f17aa2d---vekurixanofe.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/robbi2oopaiij7p6nv4md752qr/96668251193.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/tijusamaporelerogikifeda.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/88165548229.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pabunapuziwepitofubeko.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/35c16ce6297d91364da37b6bd1123530/48823749834.pdfIn PDF document text
    • http://stevis.cz/files/file/18978027509.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/87817496533.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/tafaxorovonunivafezu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217281527307873.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab242ac80---39300177005.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/zusogagubemonupebusade.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kewimozizinupajenixejosew.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/sovorilozezidawote.pdfIn PDF document text
    • http://vejwun.cz/images/waxuletibijut.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772aa83aa04---85592655895.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/konapalenemulajuwu.pdfIn PDF document text
    • http://armanetti.com/images/15655724882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=exercices+corrig%C3%A9s+masse+volumique+et+densit%C3%A9+seconde+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25943529919.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 20032 bytes
SHA-256: 4d9bb81739c364754fef20bb9b953c737aede42464980edd78461d5a0954bc12
font_01_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off0001433a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 11512 bytes
SHA-256: b85de4c83020d50b875e5f143103fc25977ebf407ccf37fbf978e33b821b5401
font_03_sfnt_off00015dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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