Malicious PDF — malware analysis report

Static analysis result for SHA-256 787f91f60121f118…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 04:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e0ee2b2790a1a785e141e1f3dc71aa4 SHA-1: e4e0aef3c06cdb33c226cf4b77525a95ae8484d3 SHA-256: 787f91f60121f118acc0a6616acbdda8d6e1c9235c3383ee323f331f0c54e0c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing and a trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=significado+de+apolog%C3%ADa+pdf PDF link annotation
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160753e0b7773c---41474228415.pdfIn PDF document text
    • http://ekotronic.eu/files/file/61176420612.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tixitefaponesori.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6b7e615b7---vafidesilugorifaj.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/zokobesesinutitor.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112e673dec03---70897063733.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/4739993803.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kaminejifip.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/52299487300.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0199376b1d8c0585dd41f44dcf293db8/52975321372.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46807191760.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vuzekiwirelede.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vutofabekudobokamemem.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/77129020361.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bixanikaxevenox.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/napemixokenej.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/134301912160f6371eb5601.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/dijejijekesevikomew.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/pumakulenukarikabif.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/77svn6hdorj9k7dmb0da1rk813/18313867580.pdfIn PDF document text
    • http://www.centralperdana.com/file/63532746109.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/59d3362cb2d6063b494d3e70b2e47c37/65912950163.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_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 22776 bytes
SHA-256: eb745f6e3f1dfd99ff4db09edfef06f3da8a09e314d010df2b81de1df149b8d7
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 10564 bytes
SHA-256: 2db6172cd2b3dd7931668a319b6d420f418bf788d517a964f228343c7b0afb4d

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