Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66cd4774f31f6f4…

MALICIOUS

PDF

124.9 KB Created: 2021-07-09 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7332569aa71b70be31dd004e6c651b1d SHA-1: 021ec4e80301f5c383031303e70e48c39534e392 SHA-256: b66cd4774f31f6f4ab876281aeabe24fcda8ab281be9d33e55ed32a60bd088cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oreade-breche.fr/userfiles/file/xaxilo.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3239e4f9---60308529947.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/eaijn2ue1u9853mic5tro395pv/69917640215.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e66e2b9dfef---54300562940.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///reratipobuxuniwidadosi.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/848f9675decc772e3cad512a769c3d39/67562155875.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/93332049365.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/30846585848.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/76181409423.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ab9caa7fff5e10c6966c75f0b4eceb16/rurudiperoxewojizopu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qar20sqfht8j7labp96pf7ce8b/86400910679.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/75310433784.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/10925603012.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e37b936e0d---37717404201.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dopitoxamexok.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b7aebdae---88385172426.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082e155ae659---71245375053.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-1/20210701220530209408.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/65760284834.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/adddf49ebf22f2f8f0c96c5d1cc07ddf/gidifaburesizupuz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b54b0b2dafc511513d6d18710d5519b0/80903890564.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/fajenanodarejipi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/kjemgnng06gstrsekbfh6hd6t1/livimunosigozowogominanez.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089befe88356---ronagibimako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+interactive+disassemblerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 10684 bytes
SHA-256: aeaeda32a8ff8c84422875fcb901d3da904b24fb8a5a0a68d72352f40754f206
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 57216 bytes
SHA-256: fd3053adc9b93ba1581fd8d2523008c0738b2e1e5ca725cf5f8ec1f9ad1699f3
font_02_sfnt_off0001a078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B88A 17348 bytes
SHA-256: 688696a52c004b61f1a9b3801f4951185599bb9decc2f6ec6ec6656f707b8241

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