Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0be0f2245c567a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 19:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 383144a17132e35afc46c067016e2ee4 SHA-1: 0652e8aada8b60fc3065957df7a6c3f21d5fbde6 SHA-256: 8e0be0f2245c567acfd359a91687a3e76432b2924926fe0d764475aaefadfe96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are compromised WordPress sites. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or executing exploits. The overall structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://asu78.ru/userfiles/file/tovofarerupuj.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/49c99b89a68cfd89bd52eb5770e6afe0/femosulodakutunupe.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/18524088231.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/22175041423.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/29154657959.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/48280195550.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d24ed52e---nipenaweji.pdfIn PDF document text
    • https://bak.vn/upload/files/vozinimorosisepafibamifad.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pq1deskpict3t0km9qusiu2fa2/fisopisejetijaperibiber.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xirenefuzux.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/90954117301.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8d473c2e---kabogupamupobojer.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kibatatapijajuk.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161373fad86fa0---gikofuvewalaf.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/61735737542.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/82590690736.pdfIn PDF document text
    • https://ambalatender.com/upload/files/xowasajuwoporatekedo.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/74415887595.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qf9aqtank3ujtbhthcd5576lti/54682532469.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/nodifunubomuvixi.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/libunuxotozibafebopororuj.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/75450014667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cricpak+hd+app+downloadPDF 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_off0000baf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF1 17068 bytes
SHA-256: 71153aec1f5b09849c915d87667864f34f1a72b3c040ab6770fbe8dbc421c4d7
font_01_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 10420 bytes
SHA-256: 60679db30f14315c8c09967fda0edcb3e278f0d966e37f21430b67bc81e3710a

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