Malicious PDF — malware analysis report

Static analysis result for SHA-256 9786292dbece7006…

MALICIOUS

PDF

146.9 KB Created: 2021-07-18 18:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2779923942d4027916cd895f48c464ff SHA-1: 1f244e4f11241820dcf88033cc6b68ff69e4fdba SHA-256: 9786292dbece700672c44e93bebbf623329688dcc0ce23b843291f421e54b251
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ryokanclub.com/FileData/ckfinder/files/20210709_1B4CC11E8B355481.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/xigivogijufinakezuwi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160835a451b370---87046183309.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/xomuwadupuvixilo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d18932594dc---37045646920.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/l2c046vkk5n1l3i0evq85pigga/xakekix.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/55440326603.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b37c1178e---98853488864.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffccdad175---buxilogirano.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/84140cbbb3ac5b11daf9a1c94fd3de79/54377592371.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/48750872427.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/54fa0c2467c2392c314510128549db08/jakatagibufusapile.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b97818084---88032876685.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/63365731427.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9c618cd8471cebc3bff2bc53b09c417a/72951921113.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3cb1665b---49242662975.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143b0a1cb2---30608534367.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad0559b4d---gulen.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/81066620053.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vesipowimanaz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc287237d0---77027932089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=love+famous+novels+in+englishPDF 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_off0001dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F454 18904 bytes
SHA-256: 62680689ea3a7f74071ca93f2f6ef194155767d9c5d8dc0752ac1032de563b60
font_02_sfnt_off0002262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2262D 10588 bytes
SHA-256: 1f1bb62fe7895c633224b5605c00fb2cd6c459d368bcb9e7fdf4cd4e03276000

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