Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7851e1b34f4e650…

MALICIOUS

PDF

77.4 KB Created: 2021-08-19 18:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b93ba0d7bb7acfed11b5351d1925a85e SHA-1: a59673a745990ba9024340dfb4029a2372937703 SHA-256: f7851e1b34f4e650025c18d4e6afcfe783a0202cbf1eefa314ef05f63aeb3152
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the detection as a phishing trojan suggest an attempt to lure users into downloading further malware or visiting fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://alnadaoil.com/userfiles/file/11460432264.pdf In PDF document text
    • http://abpaluso.com/upload/file/97286305652.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3dbdf13ab4b2600fd65d30a020d88bc6/37247242169.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d6c2e70f---54425236334.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/96562251939.pdfPDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161164df27b0b7---vavomazej.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/711f951cbf6885d4a418386f2f859a32/lolutegesixivowuvivuwobe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/dozobavopopesolukunos.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bakelodavewasekeguxawota.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gunilexa.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bt2763hndu89g5380cqmupbi97/63010180545.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/tulegizarijiwabavetas.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/supidabidexalebamugovo.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/81084633344.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/tulodinogafore.pdfIn PDF document text
    • https://ancoraeducacion.com/images/93259609753.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210526171958.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tajuniroduzitij.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4f2abf58f55491ffe5c115ab630cd249/92421487426.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f6154b4a---10371846732.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/81061625264.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa21ac460---sutekujoluwebado.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd7a0b862---tubatapamal.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dti0ve57lfj35ojs6fjvrkuntd/wiguxeselaxenot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+letter+of+experience+for+auto+insurancePDF 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_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 15524 bytes
SHA-256: a56a5a28c4e70d8193d7557995aacfda7f6b4a9bea411c4dbca717de71173a5a
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10772 bytes
SHA-256: d72e8fd3ea1985b714145882096c21e2ee1ce99c271d3e7b55f315b356e1d398

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