Malicious PDF — malware analysis report

Static analysis result for SHA-256 79026b8a57d677cb…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 04:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ed63873b48c0578c311fe72b5efd1a07 SHA-1: 2c929a920bae0980263082227657cc2fb1c9b268 SHA-256: 79026b8a57d677cb86ca7a7ddfa6520fd20e3405dcfb939a68eb17a7a82684a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://archism.ru/uplcv?utm_term=star+trek+into+darkness+movie+download+in+hindi+filmyzilla PDF link annotation
    • http://mgocsm.in/userfiles/file/refesarafuxaturevugab.pdfIn PDF document text
    • https://hse.tw/upload/file/17216038160.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/svg052017522c38a3qcmeh45ao/96433977452.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/93980513107.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/gitobozojer.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e31369a---sexeninomawisejimikow.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/82160151469.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21955e61c4---pexanuvopawogumilelap.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1be8e82782---8177042050.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaa938857f---kutofelomozedilosijites.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xavinilin.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/mefejawurevajuf.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/3086729573.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba55a86dd08---4962117042.pdfIn PDF document text
    • http://sport-way.ru/img/file/zekasumugiwiwisedegog.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5c66d9e5f45e5dc2b74224f6255630c4/kenojexulinoleb.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/vojeninakukilijunekofu.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/70423725296.pdfIn PDF document text
    • https://digireg.li/upload/birivijililetizetuloda.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/98997315864.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/fubifijepikewovonuzigap.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/midozitewuvuralokol.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/tesare.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/xazafefiz.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dufojasimufazi.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_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 17064 bytes
SHA-256: becf53a35a30255134e60441958a65ff28ef449b88e48d44bf7137e3460f8763
font_02_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 11112 bytes
SHA-256: 8a12faa591b0c4bc95d6f56ad18d5a2ce28b1bf20bb7e82e0d455de0942495c5