Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbf3fcd423425f2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 05:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d62db235365a3daee759a65028f8758 SHA-1: cde07cdf131360369ae57c9be44f1680d8c83607 SHA-256: dbbf3fcd423425f2e4c8d14539858dc2f148ba843af2331214f70f11f67727a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/8e2f31f5cf415b725011d75dc5603ba6/30335425078.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5ca06c81---65393702619.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/72023336203.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d2ac6b63afb137c4bd430dd6d4d065ed/92047222109.pdf
    • http://travellightnepal.com/userfiles/file/7514110916.pdf
    • http://kunbot.com/upload/files/tudawotezifogomo.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb1309394---21195325076.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/pezilurakomewexijipalal.pdf
    • http://wsystem.sk/userfiles/files/pumuzo.pdf
    • http://fu-xin.tw/uploads/files/202108231906323789.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087510f4f56d---59441968875.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4updbnim4uq8ucj7p4ebrr3cqg/9806717089.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ke70877km90kanp8565a14ecbi/89936530684.pdf
    • http://traviet36.com/upload/files/bibiwedufa.pdf
    • http://delannahotel.com/user_img/file/95119123927.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/33405736171.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/77322351388.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/58d012513e1badd4ca1222b047d45ab7/69219832022.pdf
    • https://manualismedicina.hu/fileok/file/29981275938.pdf
    • https://kanat.com/upload/ckfinder/files/sonizibevato.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609178922e708---90306060948.pdf
    • https://hinodanang.com/uploads/image/files/14257435798.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f884fae0d8---zabanek.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcd2aca4b6---tibewixuvunatikeraj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fission+yeast+a+laboratory+manual
    • 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_off0000c380.bin
0259a7bdf80374bd186f79575ae8082f74612bcb13109463ab0b33eb37139204
pdf-font-stream PDF embedded font (sfnt) at offset 0xC380 17200 bytes
font_01_sfnt_off0000effa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
font_02_sfnt_off00010811.bin
ad6f5d0f755c0bf84a510f25c8379bc9f33dfee175c117d833c8ea546b05a381
pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10600 bytes