Malicious PDF — malware analysis report

Static analysis result for SHA-256 a843e546fc5572b7…

MALICIOUS

PDF

90.1 KB Created: 2021-09-08 02:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99a1aa8016fb424c90c29839b1ec9456 SHA-1: 74e4707d7ccbfed32948ed38d977bc7a8ba98656 SHA-256: a843e546fc5572b76f2ec6eeeae32db9f097b2d67d9da22e2973b49eb4981bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection 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 0.9979

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1866672d4ea322cb296461a0b678acb6/88533837217.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gsjm918ej3u9v8ta0cdpdlsbit/digilonolejuxajujabarodu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/texusizopi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72d3df08c---62981879599.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7d0b5f27---nubegopapevafisijurejadi.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f6a01541---defenewevolug.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/goxewerefexenimimufeso.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1ef3437edb9c342c95ca25493f9de049/10641020127.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/58893026416.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/en6vbb45s6vfnt2fc3vrac5pvs/4273753692.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137876a4f522---kebonifakofegezawufukupa.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/656aab87b4771710f690f05cf142745b/86730362904.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77345915124.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160be77ef0dc4c---nukujefajevakizisamujik.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/fefitenuwilekepirepi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bd5i4pjk4digq930k7n9u1ml8n/77132344413.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/14124402347.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/tiwedudeniwigowu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210901_D4ABA3C2ED6011FC.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/puwukabazineni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manual+coifa+fischer+talentPDF 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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 10528 bytes
SHA-256: 5071f8d28be35821c1e8d6244b8c207a83ec1ee10d37b9e77944173a4fc494be
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 20896 bytes
SHA-256: 391f5d0246653150b1b0f195a707b69bba973d74ff9023ebef2c7c75241baf77
font_02_sfnt_off000142c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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