Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa16c7f830b472a4…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 47a74a93513d734f7e586cd49d1c79b2 SHA-1: 4d5f1cf3cf9230ed9dd19a8d211ac26b1a231c40 SHA-256: fa16c7f830b472a4eda0172c4019bbce11010c8f5b9cdb82f5e4ab9b6be51b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/dd5e203e7737a942a2fa074b2fb14fba/1357143905.pdf In PDF document text
    • https://papiratisk.cz/soubory/81004404591.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5ba09e5cd0371421c9dc043ef4223bbf/27808499178.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8069d26e---8091756029.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0f4c2f5a---givomixipopumoduge.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/wisubirisajegada.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kiwegojagodutaloguwaji.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/14d1b1d6ca57c743570903ee27e597aa/91162559866.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tivadamemut.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/mabuxufakuliwof.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/malidusizixelaletakonaxog.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/63259495771.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7c9d3f4e---wediridova.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b328350719b---kepajufawozazozivojiz.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/jadupalulonarelojo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa15a12b9f---41095612196.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/savexidajazurizobosip.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bpq4q5tt8vr2gv2q9vq69n5vk2/pifulozutadaxafuvodezapus.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28c04c9c5---tavulufipazadojamonixaza.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a71767695---9832677829.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nhl4dgcrbtfm5d5akl6v1s0gaj/podagifomiwevizebuwiwakep.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078db8f40b37---59987891800.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/51802010029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=alfred+hitchcock+hour+annabelPDF 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_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 17456 bytes
SHA-256: d3bea282adb2a76ebbab44e49904bba32c3749bd7b0dfef80613d12010524c28
font_01_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 10720 bytes
SHA-256: 7a97449952b1462a925d4f2c846a84e9f3c9a10a8e89a9c56c7282d30d8a413e
font_02_sfnt_off000141a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1