Malicious PDF — malware analysis report

Static analysis result for SHA-256 42dbe8ddd6c65997…

MALICIOUS

PDF

79.5 KB Created: 2021-08-03 05:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43db47448b9b855a91f8924169e78f0f SHA-1: d1bbaac7917fed7fe236a1d9e2ebc07c53090f74 SHA-256: 42dbe8ddd6c65997ed52037128a76df6f9ce1074101b445c10e99d371a13e5b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL targets are indicative of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=android+windows+apkpure+download PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/963829ae2bd80ab01827909d42af0421/jukigovadas.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5503c1f812---62886037445.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9b9890bc72f8d3449722050cc115a08b/3133427144.pdfIn PDF document text
    • http://sdes.in/uploads/93002485470.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/4093957350.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/sovevopilosopaz.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/57430683274.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/35283115997.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/ruvuzuzokabinixe.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/55391476058.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098715a63bad---54268467950.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be6695f54---limugozin.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/a3bn0t1519fngdcm30tb4ige4e/85373790276.pdfIn PDF document text
    • https://robertbah.si/files/file/42228018823.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/20614302471.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc30aabc01---libibim.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/44062087723.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hro1j3eqs8od2vs5vcciu4o9gl/79323212950.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/modosizidowegod.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb6556be4---76320239821.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/951f53eed2bbbd983447e039d73442de/51889960135.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/69768087774.pdfIn PDF document text
    • 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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 16336 bytes
SHA-256: 3d6f9fedacc63b9af59a87684e17fa8fdb062cf3bf002b4990277c51324a0801
font_02_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 10548 bytes
SHA-256: 38f94968c816ab8ab33670b411c5d6e2aa64bd1df8df8345ca7019d7d70ecbe2

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