Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa01093ba36f8b9…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 13:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fe1e3add21920b5e8d528f6a6fb6222 SHA-1: 448d51b99ff5099b0ba86b5131157fa87e3ea882 SHA-256: efa01093ba36f8b995b618471aa2d7c5ef5242eb5e7e6ac74ef859e1d5b34584
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47164d44e---76004749772.pdf In PDF document text
    • http://beateromer.com/bilder/file/90470574372.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609477702f503---bigesitesezulaleteromiv.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/75918286467.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f79093a3---22669082143.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc80d83af---30847672183.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5c1u40d5v1u9vdsd6281r71t1d/18257504525.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0832ba35a9---vexugubisutuluk.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2fcbbf851---losapo.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/37351168201.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e1dc82ec00296625b7107159edb1f5e9/remobinesabelurafibagow.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/83180519725.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6326e31634---35746243536.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f1757e03---12014265438.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/86756876499.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e33460d8---favasepuwenokiju.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xariruvewaxew.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/89649214586.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c152f4e890a---25524229955.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ae4f024a---jadokixotoxutati.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd72cac7a0---xojodavufamozomidobijume.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7321b6fb7---vapanozawefa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a498c8a017e---3456078209.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/7701668309.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15ddc54b8---tepaxuwupunekugun.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/bupurasevamomofukefumema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=brown%27s+grocery+storePDF 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_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16440 bytes
SHA-256: 9224188a757d5b45e9ce3406d9fdc311758d5b3c7c1caa1274b52b1b76a17c8e
font_02_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 10392 bytes
SHA-256: e6e8c4bc938c2b2a02a062a4a8fb5c0a6eec936f82a429d2f52a94a46bf39b95

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