Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10aa79697dfe7b0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 15:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 994fdc9b73ec4b6a88314e12028bb2b8 SHA-1: 7338bb9def81a7411a542e1c98835059784ddd0d SHA-256: f10aa79697dfe7b0915063a1fb40ccfaf568c2b5e94432c918358d1ee6a4079d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://przychodnia-felinskiego.pl/uploads/editor/file/3340359605.pdf In PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/18510543008.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-02/210802092421900222759ieysyf57x.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160790bc864a71---peranuvijowoviluxat.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ush8jga7bnegcniudo6lb9qg21/16124876733.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/xaligo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/debodurofomub.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210710_145154.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/54716145958.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/41111004562.pdfIn PDF document text
    • http://banquat.com/userfiles/files/dinumewujera.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565783a296---29307417019.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160700155c8784---bujesinofufepusug.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/db4c1b5659c3831878600e40071b57b2/58117136462.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/96393173939.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e4125906---riluni.pdfIn PDF document text
    • https://ghnservizi.com/file/95607793575.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/xoxalobitewegigoveku.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0763f1fde1ca18f5099d55a53121db36/65012267707.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/42941159698.pdfIn PDF document text
    • https://senhewood.com/d/files/5572142231.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • http://df-2.de/images/daten/file/momalejiwotoxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=animals+vocabulary+activities+pdfPDF 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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16920 bytes
SHA-256: 36d9f6957cae43c6a3462104636bb87d8b21be4a7d7c0827beb3b5b874d79021
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 11180 bytes
SHA-256: 230a6572fb076ace313a777d32f91e6d2b4be0d765a2b63d9a159db25b625890
font_02_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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