Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc680ffbd400378e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 02:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81863e7773475f4ed35313a091fb2de3 SHA-1: 43db6015ef278d26e113a7d904ef0731be2dafdc SHA-256: cc680ffbd400378ec76f2473077eeeb233d996dc425e85116284aa3cb6b73c8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are identified as link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • 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.
  • 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://at2apigroup3.com/contents//files/63254404649.pdf In PDF document text
    • http://utuin.net/files/fckeditor/file/famujapesugufulu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7655fdaefaafd4dfef36c3462e042dd5/71186589075.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/86513717090.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/gogibiso.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/vjga6dsmg4dg4kvhjdrb3ack5t/62947064349.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/98972473026.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/gozezozodidanogiw.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624513593.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/22474186133.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/37217036497.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/51a78514b60bbd1d340de683393b3c77/1648032646.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/72546452927.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u69mbdcs66o519u43m0mo82v22/lareno.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/76850096305.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57a681da6---39880148231.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/4783760111.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/24416869971.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/zedon.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/95424833322.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/borusifajozekogo.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/mexonuko.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/65785498614.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f25b266d---84038894040.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236b6ef3ffd---60617888494.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8ef45165ffe7e0cccdde9c0e0aeac822/78976922774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=breville+barista+express+manual+coffee+machinePDF 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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 16824 bytes
SHA-256: 6742c37fe22507b380eb4abf35828e1fa8407929ffd20285c5cdba83e6b275b5
font_02_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 11204 bytes
SHA-256: b4a2d3251f26de03459f48f65fd06d9bcf9871d1f5ada18997f57eb76a638484