Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c665addcfaf8495…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aadda70ec576cd20b78839d1d1fdaf5f SHA-1: 8295608bf95e776f28c84bc326dd96e4f08241b6 SHA-256: 2c665addcfaf84955abd940c47f59c6259c01720eceb340e42aee027b588fc32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+to+change+auto+capitalization+on+android PDF link annotation
    • https://termofriz.rs/files/10998927871.pdfIn PDF document text
    • https://arerp.kr/data/file///16718222437.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e8211958---39565470780.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/rawupigewusijujosasufaf.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/gunel.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf61c3c3---76375881635.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908152101.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c882602---62896750417.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/55865111367.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/n51t8p24i7h6or8r60m4bs6pb0/jijadililunej.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a885b77f58---xexofugomuzoderiveno.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/l7o9m5gdh88smbvbloso4feq53/13170170530.pdfIn PDF document text
    • http://ashioke.com/images/library/File/11812033869.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/44309519726.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gizononomorifekumizuso.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161337b065ebd0---penapixotupu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911104805281018.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/boxamuza.pdfIn PDF document text
    • http://kesifveotesi.com/files/nuwejogefotoradoxuvasava.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/30777970046.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/zexuluxuv.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/sawufimiwuri.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zujilubutunuwaxekojep.pdfIn PDF document text
    • http://chieucoingason.vn/files/safopubobiz.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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 10860 bytes
SHA-256: 5c09e690cff5836978b6890dbb80cd55dd4bf1be7e8789b2314edaab0feed45b
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 18088 bytes
SHA-256: 2d582546960d75a31ee4c59c095fc78e08f7071348f5aac1c8c269a4a22ce2a1
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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