Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a805b708ff0a4cc…

MALICIOUS

PDF

84.5 KB Created: 2021-10-09 06:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb993629a675db711ab283a2c96e8999 SHA-1: 1b235dc984287e40e7d5174014335f6fc17d12f1 SHA-256: 7a805b708ff0a4cc4e3a74814f48a9e3e64eae4a04dde22fe8594dbd1da6f1e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=chemistry+1st+chapter+question+answer PDF link annotation
    • https://limsurdua.com/contents/files/67535492843.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/zariva.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614005e38cd6c---15137810474.pdfIn PDF document text
    • http://robedecreateur.com/img/files/zerajowuvevefugizivarufis.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/51242063535.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158aba4ef050---11036146400.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/lajoroxurujibapuzobam.pdfIn PDF document text
    • http://uteambio.com/upload/files/fewisaru.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/37284227131.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/mamagamamurib.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/28194217202.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/xesivifinekut.pdfPDF link annotation
    • http://grubstreet.ca/ckfinder/userfiles/files/81729609017.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/75434530108.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/55706345989.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/gowifamew.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/151923218928.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37404836696.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rgjovjvbtd9dn3uqkioqbn77lu/86699612283.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vuvatbt4sh32lkm4s59j90ea60/35240821474.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/81043193140.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/somuwapote.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/27903273524.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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 17652 bytes
SHA-256: 6d9667a33d0ae1333ee8a283c45e362b6646f4427e3f31f4c5aebd47315aad16
font_01_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 11124 bytes
SHA-256: e6f3ac202c8d4cdf645951c3892aee4c9bd7c2a9c4ccf5f2067ec47fb302c08c
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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