Malicious PDF — malware analysis report

Static analysis result for SHA-256 db47c3f97b28839d…

MALICIOUS

PDF

94.8 KB Created: 2021-09-02 22:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1223189647d20cbe5c691b7a2b3fa1b8 SHA-1: 7258d4a737d2717bff0dbd38072842e5bf6a176d SHA-256: db47c3f97b28839d157d94bdf91b84808d793d5bb520eb4ef496ebe1d597efaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45febacf73---zumiladete.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5690b58898---63658156988.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qn8fe81pbmmgf98jd2so8s6mi2/niwonowevamakawekaxewop.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fukivep.pdfIn PDF document text
    • http://beiks.info/public/file/40535516210.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c3c55f695aeda7713c89418c5871ee15/tijoborilawinefininuv.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4683657935---85781979162.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qibddrbv28kuhejp5ji7nvt656/xinasutigigepolobogud.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/4948501217.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/35576757094.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/wijapalojigaruzijitepe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f84756ee1---teduw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609878fa24536---69062875296.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/zatetelepepomekazenomitor.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/tatesibokeroxawifaxagoti.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rokazipuw.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e8f3e845f---vusunuwonurifuwod.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/30323778107.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/86669915654.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a814b43e---muxaxofukoluluramogapumut.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/db36508549d8f072ee0ad6d6b7423e8d/95423125868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=belajar+bahasa+arab+komunikasi+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012765.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12765 25472 bytes
SHA-256: 8c7928abe0cc888884851250c22a95078c88691c06075467a87d451c98fa6c7b
font_00_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17988 bytes
SHA-256: 23c9cad4753cef22dc04c10707975ee1db0de53414c1098df7027a338f7ac4cf
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 11180 bytes
SHA-256: ffbb5b67c5a665322637262ae35575281675da9889a50267bf248dd07368caa5
font_03_sfnt_off000154dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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