Malicious PDF — malware analysis report

Static analysis result for SHA-256 475a6ee011839899…

MALICIOUS

PDF

92.6 KB Created: 2021-07-13 23:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32fac5edd24ac926f37b439419a814e5 SHA-1: 4f65e19f9d0b1934aca6a69189f15ac7b0d38883 SHA-256: 475a6ee0118398992d852cbd3d51d3518e20639de8994303707c9cce55178aae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The primary function appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://maility.pl_adresuserfiles/file/47869674558.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/98144406380.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7ffe6a2d---pitelinakufagiluruwifugup.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d1802f1c7022fb1a3a9af23f7fb406fd/venerawasiviwafajuduvatas.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/49439650537.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac689e69---95765950823.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb016e2b1---kexuseranuwozipadobaz.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/9754742449.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4e00d36af1798a314e9ce290c56cca84/nipinimedipekotomelateb.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/22092407914.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/fozazojemowu.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/redajefiminolovibapizewo.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/xosekurawuxebufase.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/pemolonelexanevor.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1031407b---biregevaxojatuwo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/79205197861.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/nufomum.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/5376710722.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/tomefujobixiletikexil.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16073e64cadad9---95287997863.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/32599826509.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/e92d1f2cl5gt2isj3lcrou0j1s/4327312591.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106301932.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sumerudaletolanesewajavet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+improve+essay+writing+skills+in+english+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_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 11296 bytes
SHA-256: 674769bb0217956664e743c4176d0f5784c60a46b9030cb837ef56ad270ff658
font_01_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 19016 bytes
SHA-256: 0a872a157455b6b7b1727f277e6e942654b9d12f3704153f65280808235d218b