Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad89cdc09f6e963…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 20:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd8b17aa3a9da62e9c778eb5b51ec87e SHA-1: ea0611f98327589c67e208da2e0dd0632134ddf9 SHA-256: fad89cdc09f6e9630154d6958322b8469caa892e8819a96ea36688abdfed8f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially hosting further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms its role in directing users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://uclerbaklava.com/resources/file/20317705118.pdf In PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/13372677769.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130272dee286---85482358502.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/kotovemu.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/17677179161.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/budifadowajifunofizuso.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/vokusubejusukopuso.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/25167083816.pdfIn PDF document text
    • http://ocung.net/img/files/53106661580.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugupoletetew.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/1559331907.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910170629126.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/96988519353.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4c833f1e---39134512256.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/74406538092.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/telorofevirerusijasifasav.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/jixoliwijar.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc090bb38---59380814732.pdfIn PDF document text
    • http://polletnv.be/uploads/files/74147730547.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146587b6dee4---18517846635.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd7cb10d7---dizaxoworiduzejesu.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/3481742750.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/gijesibasokunusuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=no+fear+shakespeare+macbeth+pdfPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/25540795072.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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 17032 bytes
SHA-256: 2121d2d723c3e2d10779e39559928420f4e55486b6d700b0caa01820dd9e1a6a
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10852 bytes
SHA-256: bb5eb189c21f68b8157f93ed15d1b8f38c6b70d428682d017a852f116b6986a7

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