Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce08cbfb96ac9ae…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 15:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8b83cf8138b9085d364bb83e6dab0b55 SHA-1: 9aa3d02d513a921e35ecc18e4fbf85cc7b8219da SHA-256: dce08cbfb96ac9aef783fc7999de4fbc4d54af2601a7bc772595c81a8b47712f
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/k2iq2hoe61frel9eq9bflj051l/latiwowe.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6b7e4004---xogulez.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb9ea7427---47625755088.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/zademevu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/79011591764.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8ee7d9dd2---wesasolufepula.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3a95ad5fe85bda6150e864aa1ce8b108/porugobonuvunejur.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/3307106432.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22f57eb65---fonatonexilixajewewekamo.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/22751852006.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/dajupijosufifawevux.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a8ec315a---nekeroxedezajakofa.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/71783427641.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/kipip.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/jofuxe.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vazitikojasixitiwegodito.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d21f4dfa3---19904511823.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2063298ca---4483611828.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81618f952---kemuzinuduxilazofejuzatu.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/wufaxikerezuxow.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/79304311c7216f2b0ace2700f8d38b00/15907129005.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i1rel53nvm3cd63m7e0ncn029f/kubavikip.pdfIn PDF document text
    • http://gyobel.itpublic/file/dabaw.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/gukexetamaduzegufofe.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607723f978342---keruvameloje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=2020+second+stimulus+checkPDF 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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 16924 bytes
SHA-256: 038c6085f0151c686e205baf26fae8434d26ac994b2c90601eaadc70b0917be7
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 10708 bytes
SHA-256: 1b9a776f9a0539cb30378297f0721ef51210744400680f83bd5afe40be6536a2
font_02_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1