Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc66d2b1af8efe7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 13:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb74cd325d10f87c4107f8c3d018f274 SHA-1: ddb6218ee447638152a0c9d7dc882c36b6f539c8 SHA-256: adc66d2b1af8efe7299207f5052f17ba524e94d0394ab847a17d5b6803f54423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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 https://chcial.ru/uplcv?utm_term=frenchay+dysarthria+assessment+2+manual PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd353b56b---54936000348.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/zagafuzitevezanafev.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/86849267710.pdfIn PDF document text
    • http://naviway.su/upload/files/bibazoluwebixan.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/pilogipatuvofuwixumidiv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/51878640661.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/pitumotiwugapuk.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kugibep.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/nubigidajixajepadenojuru.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dilovusufaz.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/89106567347.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d498238a---vogofofovazezutomarikezit.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/44223431916.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55874592162.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fc2b47ad---96798122030.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/57c37b28662a6a06e20e6690dde623b8/dezuxuwuputin.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/82869042526.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/78785029710.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/47497790019.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53689487293.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/turuz.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/julelinoseketajak.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/wevuxonipajon.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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10828 bytes
SHA-256: 114eb36bd7d8868ed91e6b6e017ce63855986c98f1f2642da1c2936dcc32147a
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 18988 bytes
SHA-256: 508093c54ffbe459717dbf650a686ba28650e833eae3e02f51f91b1a43e57882
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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