Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa15b488a75bf03f…

MALICIOUS

PDF

96.5 KB Created: 2021-08-25 09:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ae6c2d4d5d23886bf9f633b2cfeddab SHA-1: 4f1ec054ca1fa8fa407fedca120c935eacd91915 SHA-256: fa15b488a75bf03f8c2165feec82746e56ec479907793db1a8ee6caf03a9865f
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, and includes a visual download button lure. The document's structure suggests it is designed to trick users into downloading a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=latest+gk+mcq+with+answers PDF link annotation
    • https://amatnieks.lv/pictures/image/zogesowefazame.pdfIn PDF document text
    • http://51www.org/uploadfile/file/dd421be0e20364b3f02005472fdb767a.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/19081f66ed857cdb714cfddd20f28b46/29589623185.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977034195f.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/70140925134.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086eac0427d7---welanip.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610824dd40efb---77441462984.pdfIn PDF document text
    • https://irantruck.ir/data/file/wazezubi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a194e401a6---2944068172.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2f6577b54619f20cae5cb0ef51caf98b/19500158719.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/rijaxanizoj.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1983518d---moxowase.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zezibovi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b090ad320b3---pekojase.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/desasesutevuraxo.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/nesusatuduwubalipuxuseviz.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/kemuwexawugatut.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86adc4f025---82121329462.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/43245055426.pdfIn PDF document text
    • https://alutat.com/data/file/72668085609.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xujidodorig.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8cb90abd8f9a68bf9fe3d08f80299529/93661998008.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dc339101---walatezasanorefis.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60907c202e---30226547242.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3us8ppc2fh0npp521ujv9nh8bt/16146951017.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0a0bb5c9c---nexudu.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_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 17712 bytes
SHA-256: 898e4945f84a56b4b7b02caa0248da8f6f35291db4649fe6f1ef565d88670180
font_01_sfnt_off000142f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F8 10792 bytes
SHA-256: a341f0e2806efa1e7a0f13537f302d9a5021b833acc4915112e780849d63ee9b
font_02_sfnt_off00015b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1