Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f8ebd74eac59b…

MALICIOUS

PDF

79.4 KB Created: 2021-06-19 07:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 153b53d85a25ccebc8d727e9b16e0096 SHA-1: 6856cbbb8d9ecace9b566671ac20b61da1c3c68a SHA-256: da3f8ebd74eac59b6e367c709b128c443272f03283b3315caae5c0aac9a6d911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=sai+satcharitra+telugu+pdf+download PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974191c7232---93771681762.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608475a12cf5b---sugoxewarenisa.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/51516975275.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/66945580920.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/20842675857.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/puvori.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7e5ebe826164757e10ebbcb6f76ec966/53745090085.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/80012196847.pdfIn PDF document text
    • https://banghenails.com/upload/file/sizugonovewudaxave.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/felapepilabibagesereja.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8c37c983394933bf0c198ed60ee68518/6008051984.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7g439jpkv1moqq54jmalpobl05/12339150934.pdfIn PDF document text
    • http://adveotec.com/img/file/gujomepixijijep.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813520f3ffe---64582457813.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c301a26444b---71427455520.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/69469e11e29cb7dce33f46052bceaf5c/6727352659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 5612 bytes
SHA-256: 8502fcb4af3d587a6ff36a07aa55e931d054eba1ec1187db6779feef504aa65a
font_01_sfnt_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 22768 bytes
SHA-256: dba9596f9b0ba5f71bffcf4797c7f2d71575e035d416950ef74077052edab405
font_02_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 4956 bytes
SHA-256: 3810c9630881bdb25040dd88e2238fc9006de67e05f4f77c6dd3d3538415ae26
font_03_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 6180 bytes
SHA-256: 4acb14fc943dace36125fc1fe3061a336089a8140ddd28555c0b6f981f5032e9
font_04_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 9548 bytes
SHA-256: 225ce3d60a09722dec933f973e62b1f1149703077a73fcde4056ef4402161a7b

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