Malicious PDF — malware analysis report

Static analysis result for SHA-256 33885c5b8ac7800f…

MALICIOUS

PDF

73.4 KB Created: 2021-06-18 03:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c489ac8a77caa39758c326759710efd7 SHA-1: a9ea56f7f16d6dfb3e90d80ae1a4748edd7e4d96 SHA-256: 33885c5b8ac7800f6385833b06341aa8c496ef64e40f7cf04150881b76481978
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7413

Heuristics 5

  • 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
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079420aab6c5---72057212031.pdf In PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc130386c---69443641310.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/58843608308.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c300e993eee---fisasazunenorojuvolapar.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc38163e4d---ruwinupajerexodirup.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/a0rs9pr70bgosngksrr78hcjoi/89565989493.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/30488730562.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/i48qaem2r20l9tjq52kjrqc3sj/78250056369.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6ceb42d1f11cd9b6c157b28f30b62e58/99775629402.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e20po6hfa2b0l1tfhlsu074jm1/nirafawab.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/fofexofazivifefaxivopepot.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/remow.pdfIn PDF document text
    • https://carlojans.com/cms/file/xilefokuturasarulipixu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/92057147734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+emulator+androidPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 4860 bytes
SHA-256: 16f5e3cb8a343301e0cacb1c933d4c4f168d384a494090e87ab8352a8ac259c7
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 11436 bytes
SHA-256: b7db3ae12edc83306a7289798010315f6c277b2c42efdeda560d5c25a2a8acbe

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