Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2af4437dd0723b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 18:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff92280db4e13761e8306ed688ddad9f SHA-1: 36f878f0dac6d9ff6de4ea3b7a37757e284308cd SHA-256: db2af4437dd0723b00eb440c4fe0f4986ccf817d6aac255a3b4f7dcabdbfa3eb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The presence of external URIs and the nature of the heuristics indicate a likely attempt to lure users to external sites, potentially for exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jr-bang.com/uploadfiles/20210627120758.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda0917f39---22577611795.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210805044219.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8211661f78fbb04224d6686d0beb026/lakazipijomoxesalajimu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/49120605806.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/85385554391.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/93773539034.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/magusoxaferefarifej.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/82037462353.pdfIn PDF document text
    • http://canadianrockies.info/files/file/67514483619.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb87e6eb04---90088857184.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/4e6t55b5eurupo5unrtlltpm43/76256328342.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872706f2883---xijuki.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/37770000104.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b4f49f97ed63918cbf71a36c214a29b8/fepilaxaxodivu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160767e417fdef---pajukujojopupitigi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/da7074cb39098282b553b86ff15313d9/51432096002.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bb7cc09d19261ae0fcd506194fbd55e7/rufalorolupijul.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075935eade3a---108682528.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/zejoz.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/niluviguj.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/93111770953.pdfIn PDF document text
    • http://szwygs.com/upload/34874434327.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/68836301485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+competitive+firm%27s+supply+curve+is+equal+toPDF 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 18660 bytes
SHA-256: a136452b080167aee08df30bb273d4435ad34534d9c319465fa37ef32dede123
font_01_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 11064 bytes
SHA-256: 30fabdb64ae8795cd8372c41e60f80fc8d9e78e9de9b587543553ad589187f84
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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