Malicious PDF — malware analysis report

Static analysis result for SHA-256 0898583eaa5c4a5a…

MALICIOUS

PDF

102.6 KB Created: 2021-08-07 00:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54e2939715588afef94245a6cc903e1e SHA-1: 56042e053f927ae3750b6cbb3d1082a74b08bebb SHA-256: 0898583eaa5c4a5a9a4cf31b85f84303cc8918682a5eccb880a12ea36e3378ba
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to redirect users to malicious content. The presence of numerous unknown URLs suggests a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nr2lagahivcee09fpfq346rbg5/28630430442.pdf In PDF document text
    • http://eros-arena.de/eros/userfiles/file/18341228974.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085137a48bb7---39294891594.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881c7a88dc2---42875183199.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lkcf2h096p958fvou148saf5bd/75429191676.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/51006848094.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/gigotovepusi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/pakadamatejatomekibupudu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d236a11e5677dabcbabd0175a15e1f8/sebukipezaniregolos.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6007f97f9f---vudojizukebuzupi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf9da1b877---disoguzizupulo.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/57379017660.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/finomivaxoretonatinemile.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/nesobagozixerapijoxaw.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/59024714181.pdfIn PDF document text
    • https://educhina.mn/editor/files/95361014448.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/743a4a817c0eb89ea0c99edce63aa2df/fekulojosimob.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/80625853437.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/fidemubanejiz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1909bf55b---59806922291.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffcee52f6---94026456683.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f662cd3f---65386707288.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/pobafezazemoxoderixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=johns+hopkins+obstetrics+and+gynecology+book+pdf+free+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_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 11324 bytes
SHA-256: ab24948f573d2a53a58029fc29dd1e7ca929a11f7081cc0a4f5e983320b553b0
font_02_sfnt_off00015a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A75 18736 bytes
SHA-256: a4c463a60fc1acd997939ceaacc0ef7091bb159439ce7c875220a9e85d4fa871

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