Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd878989ec5646…

MALICIOUS

PDF

97.4 KB Created: 2021-07-04 14:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2656554096bad9aa7b361c8a9417ae8 SHA-1: 032df8c38fad930c373461c35f94bb593046b4c9 SHA-256: 19cd878989ec5646ac54bde844ded579cd2e9059ac376c69a104be1a6c238432
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content or exploits. The primary attack pattern observed is the use of a link farm within a PDF to distribute malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://betentour.com/sites/default/files/file/lenelinepofalugegirofav.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608239d0b126e---nupomoxagale.pdfIn PDF document text
    • https://mmszke.hu/files/file/55688407035.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/93813664685.pdfIn PDF document text
    • http://cichanski.com/Upload/file/33348789315.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab314959cb---mamafuvefujevati.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/85663133037.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5899440a0959cc0ccf7f91666da1150d/jukukugexigu.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/78248656139.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f3f4a834---zewuselojefujonebatewoj.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb9ad21d5---39038940706.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kowobezeniwil.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767f509dd8c---kegefinigab.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eh8u3fqn8uo9f9ol9c697tn2ou/70039420621.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/diziwabiwanojazowazamam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b279da2747b---pilupujedefepif.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5656bd8e7f---91602637915.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/50oni91e4k1a94a3e0vcvltah9/paxobosazugemukutijum.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/87602bd90daeb33a7258c8a95b657775/bijesizozipopiguru.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e47ce1e96d---povazara.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/38b3510664f93631ab2c4557cb7fc202/wizolitapabi.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/sejivavevuzavakezurutix.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/sofobodukizefofozedos.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/tobosotowevufana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sheep+grazing+for+rent+near+mePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6e28a75fd29b0eaa07c84529dbb88c46/vesaxunijorideme.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_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 18536 bytes
SHA-256: 55983ac2c2594d19d8be4ab0d3ca3a64ca9f887de2f2526263ed55e7992d2280
font_02_sfnt_off00015e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2F 10728 bytes
SHA-256: 28f7f8378b07bedbe2a07cebdf171dbe13ff5759870a88771fdd20df70a9025b