Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c66303cf4a5bcc…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 06:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 297b9b0159fb21e48e3c07d835eea3e3 SHA-1: 328d5fe6e9525df9154a27217485c173947528ac SHA-256: f9c66303cf4a5bccac627653e5550342b3ef4b502e4abe8f5174806c7e5deaf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b633be3b5ea---16826281130.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4292f0da3d9f9a097fd512e1b1115514/93113605745.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6n1uqk5crf9f9m7b4gm4vaodp3/pudojamezidapef.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8b82aaaa---mewirutabofunurifogo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84c9ed16b---8342752625.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/31024421479.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/d4mm4nq3rfq17htp34aa539keq/94581313818.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/60dc9808cf2da8f735ce46f0773b2709/31140377496.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4d41bb654b6e00bf2adf3479c3df1c31/robabubukezu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/aa15addef6edcce578b3a673055d1ead/97455127502.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf31fd9622b---94782770932.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/29b06au38lqinm87ae0mscq623/lifenefikibukud.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/jefajogikowefiwaf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c9fd686e---xalafu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608066c7ce63c---36765013459.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a019dd3nve1ilka62i30t7ai03/lurigisagemofovunuzifereb.pdfIn PDF document text
    • http://mutitar.com/user_img/files/bosupexabijowexop.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/56076524240.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f2c1794d---67399726813.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82b334222---waserabebifokotad.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/posuwevupexofemonotovofow.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/27850742488.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160753193bf6a8---876344584.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ccd7261013029a2a054cf9eab10b4b73/16423295088.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/wenepukiguvezikotuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=indian+apparel+industry+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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 10536 bytes
SHA-256: d4da0aadec5cffa30c08b986a307495748266693eeb061e0502cb1a96f0c9a27
font_01_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 17488 bytes
SHA-256: 56f7f852bc891219faad82260620991c4edeab5baab406a6f6256da5d2d17a6f
font_02_sfnt_off00013789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1