Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d9eec12da5927e…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 10:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 18cde521dec6a6b50b8a757781003eeb SHA-1: f3db88634c8967673a0b01f6c50e80083239ff68 SHA-256: 21d9eec12da5927e3b67e19c1f4ab19d560f180b1ff281c3b7dc53a5ca6ebbd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9ho8sb5sc2humqokbborvg5g58/fuzuvenusokakarukilipazab.pdf In PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bepj8e989mgnplg54vnqt8snst/dudesipa.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/jafigidopevot.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/i9i0tqofnpihblq172b90cg840/13988048162.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c337b0f87---46059269646.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sofaxofobovasoruki.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a2445975c1c9743afa84c232b2ec737/xonurisobimonanada.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/523o7dcj38tugmsjvggje0rag5/49462408941.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lavixofajozepofojekajet.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/pikibota.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/66904056956.pdfIn PDF document text
    • https://irantruck.ir/data/file/fijuwibufovarukedixozati.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/86d43399875b6311d931a7ef5d7876ab/85526512820.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f17ca8c7---20851589934.pdfIn PDF document text
    • http://beiks.info/public/file/zatenizomefikelafovefa.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/i5vf70vsp5hpupiafd63jsr7bm/39712851613.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79a49202---vixetowabija.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/8629638496.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/26cuc591gg56n0l2v6k2val9ib/tuxexakadonakini.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e158fa124ef5d5ae655d8bda91044111/52438878306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=employee+conflict+resolutionPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/37856902172.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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 10676 bytes
SHA-256: 7f0e16a641682cbb78d8bfb7538f7f83fb93aad637b2a8ce0e526b0d1c6f62a8
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 16736 bytes
SHA-256: 567757a98680423c35e695e532d1e5fe180a088efed404c77deb290793832e30
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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