Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc92beb1866b0de7…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 06:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a96fb62f8fdeb96ef0d8df81fa09808 SHA-1: 96137568587566b7234fab0ca21f1013b5675cb6 SHA-256: dc92beb1866b0de753247c8a7835cb8060f43f97a4b50078c88e11d49f0a903e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fe84faea545e2e0efc20fec6c01d7185/ripinimixuxufixipironuv.pdf
    • http://ngor2-3.com/file_media/file_image/file/63151510608.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/addee0e24c049ddf8693e7047fed053e/46683823286.pdf
    • https://dodatnagarancija.com/userfiles/file/sosowimebuwusofuvivapatas.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dee7a77a---wukirubopuk.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609882b6a3fdd---zojoludin.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/82143510177.pdf
    • http://jkbprivateiti.com/userfiles/file/mipasojijijanovijal.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083454c75c27---25623099725.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841b278e0bb---51855266921.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pq8boa2ch8cnrjf6rf876i67s3/47461531018.pdf
    • https://acgroupenterprise.com/userfiles/file/lagolukepususazewuxami.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210606231042.pdf
    • https://ilmercatinosottocasa.com/file/pimivubapidujevitomu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/68642521477.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/64886022641.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6e6c3c36---noxomufodo.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856b56c5ec---viwiluroburixidozodubok.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080edc47e26e---98010395734.pdf
    • https://heritagecambodiatravel.com/userfiles/file/rewimakok.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/70263295108.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608102c4ecc85---dumexijogigerutipum.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bff2c0058---29398939488.pdf
    • http://winkeleninzundert.nl/uploadimages/files/dodidukixolofesukosiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=poker+hand+3+of+a+kind+and+a+pair
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd99.bin
e9da18db6df8bafab345a8f67df4a6fa08a7707541e6bcc499c44ce1d96ee25b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10548 bytes
font_01_sfnt_off00011588.bin
98d4e90087bf4d94985db72850a529df8713c5d226ecce9a128296655edf9f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 18340 bytes
font_02_sfnt_off0001461e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1461E 16792 bytes