Malicious PDF — malware analysis report

Static analysis result for SHA-256 687bc650c826b2e2…

MALICIOUS

PDF

85.0 KB Created: 2021-08-26 10:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e93691f7a77e3d978c6a8372acb06179 SHA-1: 4ab287a8063d15ecc3c26b2d2bd2df12353e29ef SHA-256: 687bc650c826b2e2023cd876c8a934343f119e9bf849785077ac844104ab3e02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of 'utm_term=download+aimbot+fortnite+ps4' in one URL indicates a lure for game-related downloads. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kowel.com/ckfinder/userfiles/files/1626118061.pdf In PDF document text
    • http://stisk.com/file/11522100972.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/25463637367.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61f0120f2---wetifesagoxuk.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/86034352039.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/vorerolor.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/timomoji.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ce2a6717a---pigujerop.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784c18dfd5e---707249649.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/58gh5fgh1upvsdkvikb68nepj4/28362304414.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/jemezuwiv.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kheemd2u1mcvh9j8b7r8mblsp0/jilabuxedoxojawexas.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b5ddd419---gopukujadotewuvebexedodo.pdfIn PDF document text
    • http://schokobrunnen.com/idata/korowuf.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/v6p3pot2hja33vt2pnrqarjofu/vozefafitibik.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/papaxomekeresezogatu.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210803232215.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//mojidif.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b2006ab8---jobegafozaju.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/pusogovebixuna.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f88884542---soxosijomutemositabofet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+aimbot+fortnite+ps4PDF 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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 10964 bytes
SHA-256: 5411dfe628e836d0937517e73cefe1ad6d12d6a911268563e42f5701e36ada4a
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16972 bytes
SHA-256: d1616f642e2a6de08de4d0d7cffd7231cbf6ff869c7cf40c025d0a864e32fffd
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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