Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36884b7af666c3c…

MALICIOUS

PDF

104.2 KB Created: 2021-09-06 16:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4dc1bbed9d36640a9c1ed00ec64a8863 SHA-1: 7cb275ec402e48be7d1353b85f6d3638631672bd SHA-256: c36884b7af666c3c4c595a9bb63eab06de555a528877bf2cbdc06c33593e9087
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF's structure and the presence of external URIs strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/g7t7eqo66glu1m9ls9o85hk362/67489120573.pdf In PDF document text
    • https://educhina.mn/editor/files/68542841953.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/71860288453.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/16612958416.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/22939366459.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf4a006a3---xozusoxefamiribavux.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8192c42899---jejukadoku.pdfIn PDF document text
    • https://banghenails.com/upload/file/85359761662.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210728_A1B33709666B1BCA.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/38324343399.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rapenudaxiwim.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210709_4974ABABF12F9105.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffd1dff15---tebabazametabipegipipaw.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/zuzuvot.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c29b8401d---92309780755.pdfIn PDF document text
    • https://medpressa.ru/files/file/kituwoj.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fb4d5eba---fuvokipedosetifibak.pdfIn PDF document text
    • http://classtool.info/upload/files/sibosunawabijigubemojegen.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/junojavegapuwe.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vv312iflmrjbkdl7jgrid21s68/65072665631.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/buxanaxebepuwopof.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uoastno8foiggf60k8m6if5677/7392760873.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/6502804673.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/xadigalagare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=domestic+violence+bare+act+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_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 16936 bytes
SHA-256: 7e156febe1dc0e25dac5eed282d377c6bf3a105bbc4a2795e759bb87a140a246
font_01_sfnt_off00016117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792E 10988 bytes
SHA-256: 4cc03d145e0ef48b910bd5afe428f686ac82ec825864efc3012243ba0c903431

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