Malicious PDF — malware analysis report

Static analysis result for SHA-256 98140721727504a6…

MALICIOUS

PDF

119.8 KB Created: 2021-07-30 05:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b8be8cd1b63a5a5cba06707d61088e0 SHA-1: 922ede201cc42ab817522bed477ff0012d317cda SHA-256: 98140721727504a65bd7bff3de5d93187a2d20a5e6f70a0970b6f7e4b57930b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites, which likely serve as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to external, potentially harmful resources.

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab4691e91---81133554117.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8bcc048f8---26480223697.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d56b0705613974bdb324103c85fe5205/85208085843.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ff44848053a5773e4ff388bd98f4f034/77669277992.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/fab05sq9jaoa45haoaooeo0tk4/59890483824.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f207b2b087766312fb7cab6ac6196cb0/92769764126.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a3ad639a---57877709650.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/kezimuzozekup.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/06046b54ea2f41606f8ddd278d342420/juxalokubebumewaxufesox.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/lusud.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdfIn PDF document text
    • http://vhshf.de/File/vadumogul.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/55l0nlik4fhpso2jo4ggccc3d5/jijisitituxore.pdfIn PDF document text
    • http://rentaruedas.com/files/others/masolexapegusufowom.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/supumup.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/doviwevawisugo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a3d6d49d---89780653849.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/61370927207.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/sisikeredawe.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/60489262464.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/55899623010.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/pajunaxozusa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b920f5a5c98---11159694680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=galaxy+s6+edge+manual+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001714a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714A 17400 bytes
SHA-256: 1dc4f4984500e5e647e0fedbb1421def2f20010dbf6e472aab77f1fdbbd07855
font_01_sfnt_off00019edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F3 10952 bytes
SHA-256: 934d64a42891ccc4c21a699507c750f5ab061970c54ac4f2184f53bb2b16756e