Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8c558e4f387562…

MALICIOUS

PDF

94.7 KB Created: 2021-08-16 17:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c491d0ad828be3b5c974f3caee517f14 SHA-1: 8907fabcdf77e2ea3d9293ec7225086799c7cea3 SHA-256: fd8c558e4f3875628e56b490b24baee414c630c2f9ae7d8c8dda6502b853a36e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ecf9e38c---13706870397.pdf In PDF document text
    • http://studio-castiglioni.com/userfiles/files/80602732851.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/39727985614.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/kiwusu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9o35ajsnk95ljs5ntl9s68j1k5/76088547019.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/5602175416.pdfIn PDF document text
    • https://sambelteri.com/contents//files/19215940859.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/15459584ce8a63042630259958eca33f/bivowumagekiwatarewe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ccd7541a6705e9a1df4527a6dfb254e0/2589832810.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072040771c0e---xamonegobalidofep.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091afb63ae24---jigusoxesozo.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/kenikesesagelasa.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/71268195748.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/769ece2a905663e8146eac2a883dedb5/komisukolezatajesovum.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5eecb1684---57700181964.pdfIn PDF document text
    • http://partnercable.hu/files/12982109123.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/91183319795.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/kimotizotozibewalaxofovi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8440994f03---xapewunulakowavanal.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/begazemujisuzujavu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fe2df847---zoposerirevile.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9a38417c692c3f90585c4ddb6871e2d9/bumirilomakonazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=distributed+systems+principles+and+paradigms+3rd+edition+pdf+downloadPDF 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_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 11576 bytes
SHA-256: 2066799d51e4e719e2d14792073fa2ec99e5f90e22810dda187c0cbbe2b203ee
font_01_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 19056 bytes
SHA-256: 90a90e60f7d7a09c6cc78baeb9896a6777f81d63f09decfe46d01c825ad66c31

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