Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dda1054f0feb63…

MALICIOUS

PDF

77.5 KB Created: 2021-07-04 21:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3b2c574c5f69906f3e27f8f2bbe8be88 SHA-1: bfb7756acabe872342e5081a95212d817d8e8589 SHA-256: 45dda1054f0feb63d7da30766e1a397a49de3d2599d9161be5dca7f58ea0784a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9953

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://moto-trend.cz/public/files/fck/file/28280065485.pdf In PDF document text
    • https://agermag.ro/mm/file/jetenaboj.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wavanusifukojano.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1f573ecd8f5b75d6ad0d5731c64fcae7/muzoradudibakekuraj.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/aes34og2gqslajgpe1fjjtco3u/sijowabirixed.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jakazemofi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608324457fef4---jimaxo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b873d3539d---42535299398.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/61576219161.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/pinizuvozore.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/83865293408.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bad822e649d---85494635333.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pomifujotiketu.pdfIn PDF document text
    • http://thedreams.cz/files/fibovogajibamiti.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077100f49f84---55260308841.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691779f9b0---gabezakixib.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783de89841d---61674692477.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/kawuronov.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/eiqh2psdfasocbr376g2v2q1t3/73213255311.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/suvitesivudavokosesazugo.pdfIn PDF document text
    • https://ibextrail.com/editor-images/18520620329.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70942e822bae436fc801f8c7886fe1bd/2916938895.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fukulufewuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=daily+seven+little+words+answersPDF 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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 10508 bytes
SHA-256: ceba2926d84c03bda0a671844523d085da4a07527300407d76118cc8e213cb7c
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16588 bytes
SHA-256: 586f4450aa8496d2fc2e4a175196fb78308442e84ea9285b44258f2813761a98
font_02_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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