Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb9b68384e5f62d…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 18:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06283687dbf158558ca054551b11e194 SHA-1: 25b9382e1075701050c101ccc1ba19dbbb5f1a03 SHA-256: dcb9b68384e5f62d9bcb681d4713cfe4a0abfd9fc44b44f5c99c3c830d484236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2140312db582e59f9ea3cd5761634b35/74832581098.pdf In PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6eknt4nn6ii93dj4nbb92i3dh5/rapefuz.pdfIn PDF document text
    • http://mesterek.net/tmp/bowexobedufuzoba.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/32022784797.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb2b7612---folebanomigogu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7965f9b180119530b69a6be5c4b5a52c/29691459607.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/waxowutukofiganeje.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d655565e8a2---xawomulinuwiro.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/30816150144.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627155208460.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/waxugesoduwu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/44f7cd08a3bcf46eac02b44207278924/16867013938.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336287e633---14782323180.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11e557e36c---tomulatapilopek.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16092241aa8cc3---pofasedisoluludotidofewe.pdfIn PDF document text
    • http://kotolantopeni.cz/file/busorevirenarifema.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/68642900623.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/bajubasidodo.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/73781692914.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/snmonlhc4cghulqmmnm4tl12l0/15095618001.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/99859847353.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e717848f---vekab.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9c747ea98218a78b474e75c68cf0cd8c/sowozu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160755b4698969---92745794076.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3bdd13055b6ce6ec1e0af3352653835/86641445855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+fourth+coalitionPDF 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_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 10328 bytes
SHA-256: 27c2f0acc03001ecbc92b2b9f3992737a1082689bc7b5311b0e6fd778328b47f
font_01_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001427c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427C 18548 bytes
SHA-256: ce277e11ad6fa0a5be7c7a87a9ca66bb9755ac4a042b2f5ff83b2e9f479d7b21

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