Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbfe28cf5995f52…

MALICIOUS

PDF

95.4 KB Created: 2021-09-03 00:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82fec98e1286b0a03f41ac46a541a038 SHA-1: a5a81848ebd843355dd68f6477aa28fde0333012 SHA-256: 5bbfe28cf5995f5234cf44a82bd1b2d40884130a4a09005da3adb4fb6007583c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. While no scripts were directly extracted, the nature of the embedded links suggests a redirection mechanism, likely to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16079296ab9109---tisikidegifofisij.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/fuguzipilez.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/43805719162.pdfIn PDF document text
    • http://teknis.it/userfiles/files/sebopetodetojojatadebu.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/dokuwebezulexufapojutolok.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b038c6b3b---womelenunolevaxufos.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/29567134494.pdfIn PDF document text
    • http://186086.com/upload/files/xenibu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a94f0940dc5e0693927bb44d5dd4b5b3/51567357027.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea62265fe---gadivogumimavubuwaxanoge.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/42675811428.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/72371428475.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/91612268fd8bfa322e9981b18e5a2b1f/pofopadazumosew.pdfIn PDF document text
    • https://micsys.in/userfiles/file/46249087872.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f78d914---72904643485.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13278964861.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/39a7d54e9f1f5f786f02bd003b9bed74/rigunodumuj.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e635f6ff5a---40246485685.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60d67ca7d---sutaruleko.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fed92457---15489003030.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/katevatu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c6733a56a8a073f74e9cb80f986af952/31239925082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=etica+empresarial+monografia+pdfPDF 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_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 18260 bytes
SHA-256: 10483a9c027e955a6a9c5b6be563240c4e29f17b5be7715dd45242319c9a3a87
font_01_sfnt_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 10948 bytes
SHA-256: 804d5d9af042e30cd58634c66232c46340876dcf5985b1cf9b4053572b1884dc
font_02_sfnt_off000157eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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