Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e7742f0e2489eb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 03:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 291a71fb277904e7ac58c601c3fbab80 SHA-1: 33435f6a1cb6916d24e66b2801f34537eda969d9 SHA-256: 33e7742f0e2489ebdcb15d915c75a21754de574d200b663a18eb12382e949790
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external websites, many of which appear to be compromised CMS uploads or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=the+will+trent+series+in+order PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07cff05ca---80792032370.pdfIn PDF document text
    • http://aven.su/userfiles/file/72937779915.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/kifowijimirof.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/dexofimovukovipibujixa.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd9d2523ba89ba8fd14ed6a5047cdeec/gaxojukexe.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-16/20210716084620181307.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sanirugavigiwuzuwopalotis.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a9g7tjiemude1vo8uog1sf6vr5/65075002982.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/74860591134.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/jarotomavuporojutomefaje.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/120dfb62e9d723fe6efa1370e932430d/69023923003.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a961357d6f---mugek.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/52961174203.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fc5567283---dofizigunafowegipojes.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/dusegomigelofaso.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013c077be5---96898654845.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479557e2a9---38628739147.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/pekelexenozamafojifojegem.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b59616c012655fc9d5f59e7c6bce91bd/15478881917.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/dugesenidemirefanapuli.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210622161352.pdfIn PDF document text
    • https://soltendance.com/stockages/files/dapanivokuburotowawawi.pdfIn PDF document text
    • http://classtool.info/upload/files/1332021071.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/75172776666.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/ae3c528cabfe36c397762fe6c61c641b/65150532087.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/08ae13c73ffb24fc9f3add2081ff6876/51033574262.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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 10232 bytes
SHA-256: b7b0e7b1a4a3e84831c4b708bfd6fc4de0b1161be7387bde172863616ef42711
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 17588 bytes
SHA-256: dfc8c0763fa9297ae486aab8140f3f5420735ee43f5312d7b68517413271ffce
font_02_sfnt_off00012daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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