Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e4aa85e665614a…

MALICIOUS

PDF

81.4 KB Created: 2021-07-19 06:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 789a313eaf512d1d5e632f3751683083 SHA-1: 4f185d4f9ac6e032b59fea77c35e1876ed542692 SHA-256: 63e4aa85e665614a55876a04cb023f098c5cd6c6a9088501586b8850147128cd
156 Risk Score

Malware Insights

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

This PDF file 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 embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/13265283748.pdf
    • https://stmarys-perthamboy.com/upload/File/7760083506.pdf
    • http://chinahongji.com/d/files/5479853474.pdf
    • http://arch-teh.com/pic/userfile/55232267854.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec9091202---95376069919.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5c2c5d85aa3e3ae4a7539660317422b0/gopinevenunelo.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/89e0b77236026d7b15c14a5c82a3f671/12257405458.pdf
    • https://akapacha.com/userfiles/file/47391666705.pdf
    • http://trivio.it/userfiles/files/zikuk.pdf
    • https://coil.hk/upload/files/redafetivuwetorugogud.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/7141173022.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba556ac3f61---vunizakokikakosekasedawad.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/466a4de35b4a61c2f2eaa5e294f4cb8a/wofapefutalujekemugijuras.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec0a9b60b4---57729213411.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9c9e2586---renobowazarulirizatebara.pdf
    • http://www.sudaff.com/pics/file/49047374681.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/berovoredevomozud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fishy+on+me+song+id
    • 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_off0000db16.bin
998ef97a5199c3de71f267693a25c2b7f8b476bace9255bd721d741b2e85d874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10380 bytes
font_01_sfnt_off0000f21d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16792 bytes
font_02_sfnt_off00010a2f.bin
5160f8832742dbbf1e04aad4244d5be548b1263234c56e0f96c34ae28bc20f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 17900 bytes

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