Malicious PDF — malware analysis report

Static analysis result for SHA-256 379af1b6966edc8d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 13:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac2ce65301c03d8813f676cd0cad7320 SHA-1: 03f24b4dc419d2cdcf7c6fd46f365ad7d4152d30 SHA-256: 379af1b6966edc8d3f735d63958bcd48e8c3c276564cc4415529e29e8f48d7d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=ispoofer+iphone+pokemon+go PDF link annotation
    • http://slovbau.sk/test/userfiles/file/19031585011.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-21/20210921035224778264.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/siloruvevimowunodad.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/85363936703.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/75081827874.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/bezilegirabuzefekewimafo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/11246966062.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bilemabibe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614e70d392088---kojugawekogixumimibur.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/29904533347.pdfIn PDF document text
    • http://partnercable.hu/files/50803818575.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/82216123267.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/85036778910.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146838dc3c71---vujalokuburefexowagoliwor.pdfIn PDF document text
    • http://indemo.pl/Image/files/vavozarul.pdfIn PDF document text
    • http://schokozentrale.de/idata/7283429017.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/nimiwapatepokevizalo.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/13357242648.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161414ff7e0e5e---33076792014.pdfIn PDF document text
    • https://jin-ji.com/upload/files/vabexafugafibok.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/12635298931.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vixakasidoruluzimikatitab.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/rilobuxarifojiwi.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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 15868 bytes
SHA-256: 78c4d69aa5641d529dc03e5b9973f7ff14099d90eedd76c6638d6187626649dc
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10540 bytes
SHA-256: 99d0e8903168aa2f942baa82d4ec5adf7053c6198eea5e41831b47f6ec97d103
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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