Malicious PDF — malware analysis report

Static analysis result for SHA-256 b267f1a98ae20ed4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 02:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 473754daddfb67cc976ca61994e73f37 SHA-1: 6c996dbdaa893245a7ef3a4f2883c0e415a47a20 SHA-256: b267f1a98ae20ed44a2093beeb79def2fb0f734fb8b2b140bf0bc452ec4c7de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://infrive.ru/uplcv?utm_term=manual+fan+control+laptop PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d0390ec7912768c4d74e05c1b666d90b/wikiga.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/jufapalulega.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/63475309850.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fb9f2290---18903172708.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b3854f7cf5df26ba9274967bfa1aefd5/sugudovasufalomadejata.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/22660945235.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9c7b03765---44262103539.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609df43dbdbd4---fikowewupofanig.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/teletugomenenotozak.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/418eac4dda9fc034d9b002d3af935a6a/31174149278.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac050b81608---kolebikolafefubaruxawuk.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/80150572449.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/34604017912.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/kalaxitediritiwum.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/logujejegajeseke.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10128134746.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/088604530780923e5bf4694d10ea018c/kewudisowitizif.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/14129432871.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/83946838868.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/mevebilekeg.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/pegewikilog.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_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 10172 bytes
SHA-256: 8fd13f57be232a27c4387758f60da3a208ced68d054aac74c87038c0987fb720
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 17332 bytes
SHA-256: 4ce8c4ec2f1a1058f7d968a055b0184dda37b238df654b8d10392a896b8b443a
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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