Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b29e0cf309dac6…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 13:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202628de79d8e3f72b2b62bbca7faebc SHA-1: 22c8b6251a60193b8bbd8763f39508a543d4a938 SHA-256: 65b29e0cf309dac60c3ad41c9a373601be1dcb7510d58792c004e346374bdf70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript further supports the potential for malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cdmsig2.com/ckfinder/userfiles/files/21468240605.pdf
    • http://lonniestireandauto.com/nbloom/fckuploads/file/rukobiwupilisukovuko.pdf
    • http://cdjuchuan.com/upload/files/dosif.pdf
    • http://apsencollege.org/test/fckeditor/file/zesikafonagiduxosi.pdf
    • http://marupi.de/UserFiles/File/pafovizexe.pdf
    • https://tainandentist.com/uploads/files/202109280717394243.pdf
    • https://mlspoland.co/files/file/58711795651.pdf
    • https://dolaodong.com/userfiles/file/21797045067.pdf
    • https://andhimazhai.com/images/files/tinaxivosorebifak.pdf
    • http://cuuhoatudong.com/upload/files/dukalowukipufemolel.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16151dbb072a63---joraxusefolagekuvat.pdf
    • http://train-in-japan.com/images/blog/file/4285703983.pdf
    • http://bjxbw.cn/userfiles/file/72043482687.pdf
    • http://cs-golfclub.com/ckupload/files/bivesifibigezapuzelulova.pdf
    • https://next-engineering.com/userfiles/files/62765398676.pdf
    • http://metamorfozyayincilik.com/userfiles/file/betasasiter.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3e15684292c13946c6b256076fd428f2/netepebujuxexolovesaliwik.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56962614209.pdf
    • https://careersourceokaloosawalton.com/files/public/24140592004.pdf
    • https://eko-briketes.lv/userfiles/files/4640175463.pdf
    • https://12shio2.com/contents/files/fugejonuravifalum.pdf
    • http://w3-japan.com/js/upload/files/pebepowunovidajejuwu.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1eec786f2---65330262798.pdf
    • https://evrenmentese.com/upload/ckfinder/files/lamirapekaxinirabisepik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+robux+loto+3d+mod+apk
    • 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_off0000b2e3.bin
bab9224009bbf94985af8326a2dc6503156a7331767ec2f9ff1d87969ab64df7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 16796 bytes
font_01_sfnt_off0000de29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16792 bytes
font_02_sfnt_off0000f640.bin
ce391054f54177899cc63e3c13607c60a11d0ff97ed1f900d0d2e15349ee08e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10772 bytes