Malicious PDF — malware analysis report

Static analysis result for SHA-256 53449dbdcb54d4fb…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 03:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d5cce52a0bce9ab5be32e453a7fc642 SHA-1: 32ed1997d0cfbb216214b4b667eb6aa60033fb29 SHA-256: 53449dbdcb54d4fbfa5ffc8d90eeaab507dd90266ecd7f80f93c6b36afbb9715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use URL parameters indicative of link farms. The primary purpose appears to be directing users to download further malicious PDF files, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

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://wastran.ru/uplcv?utm_term=converter+word+para+pdf+baixar PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b245de40ba9---nekisulaki.pdfIn PDF document text
    • https://mondialardesia.it/file/pewajofakar.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0902840b402227fcac01f734ed836189/pifep.pdfIn PDF document text
    • http://xsteelstock.com/d/files/zuzojesifuwezewoxiv.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1833e429---54740917451.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/nesojezebadira.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/91314607767.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ccdbee5111718693e498eb82a5766b72/92640042289.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb908b85df---25621088886.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3k0asbd7akc3gcmnij1q3gqcm0/nomujidatujakuxazo.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1623267507biwonukulezomiwet.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxukob.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/517528f33c19417edebff003f6bc3c0a/wifonufulow.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/basigudegagane.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/60610097526.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/tolekuteratuwaxisobijo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/70942372713.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/zikovepunug.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021080419500723.pdfIn PDF document text
    • http://espokebar.com/uploads/files/vuvuwizoxidojonu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/78605821953.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_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 16784 bytes
SHA-256: b7b077c7eceeac9e0a31195622d85e951e981bb2ecfe20131ed0e42cf1a839b0
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10700 bytes
SHA-256: 541976d042da99515ff1ce3f9367dd48fdcb85378e109e4c08b2f6183ebcf1e4
font_02_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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