Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b8d7d477c89941…

MALICIOUS

PDF

73.0 KB Created: 2021-08-14 10:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b452daee899e5ccdca261cfc4b0e67e2 SHA-1: 7faac20a92930553b09e8098b57cf3143437f2b3 SHA-256: c0b8d7d477c899412ece0cc7564db27b2d81e41d7af36ef09de5a4a520f5059f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the URL structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://insidethedigitaltrend.biz/userfiles/file/12607112724.pdf In PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe03759d0---20916419949.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/61i8bu8p8og7qcddfh8jito1c9/47032847422.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/88514405632.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/peduzofitoga.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611767ceabdc7---lebuxujixopa.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/34339191644.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e4f52a1b095df9d8b70b3df8959081c7/79925723411.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/26181171214.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sugapupafoxubo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7ae1bc4e---jijumewepoxakug.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/52123269473.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/pimovebalevoka.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9eb9d3f950256ec44e2e9df315e51065/kovesil.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/80464084992.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/c0s2jo69r4fc96m6q1fagdbhu7/netilivexazatipedune.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/99047205383.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/rimupitebususuma.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c900f457092---13232931711.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/51855821498.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7118f1506d---topogif.pdfIn PDF document text
    • http://faradbox.pl/files/file/rugopawafosokuvomevom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=multiplying+binomials+worksheet+box+methodPDF 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 15520 bytes
SHA-256: 8fd6ce6777939d58c284813cb43d5fd104ce31884e3f63174b410d1a57e95f20
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 11464 bytes
SHA-256: e4027dbaa0635e4597fa7bd4a86175caeffbc93ff1964e623df5f4587d4d975d
font_02_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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