Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6913f5c70fd343…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 02:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 683fa2343184201bd71cdac2c7b7c422 SHA-1: b7c28e5cb8a0d1be74a8d3f9fd8794feb61f76a3 SHA-256: fa6913f5c70fd343d55d91cdebed5ed4650bbba26833b8b4a4aa63feaddcd26b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://poddertradingandindustries.com/userfiles/file/rovidewexunizo.pdf In PDF document text
    • https://elitstroycraft.ru/source/file/zoxoxisevidomokifowoje.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/17863674034.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/18474407247.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9ca7c4549b45042994fa314b02555f20/dafilevege.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/33212484676.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/komirofeseginigivavafis.pdfIn PDF document text
    • http://aven.su/userfiles/file/3255520867.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/74004987644.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/18323982092.pdfIn PDF document text
    • https://purefeeling8.com/data/file/momifevanolasogokojitat.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/avbc8qt7o8a4b4b7cv0s8dneb5/puvanisajuxovumi.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/situteveni.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/19805001433.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137baf1875e8---wifakife.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/xejijisi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5829ef17e---zasejevisoz.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/fejufaxigadepeweteboviko.pdfIn PDF document text
    • http://olympusflights.com/files/files/vugesuxulumeboxo.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/5308205307.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109182215372797.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/rolaju.pdfIn PDF document text
    • https://successalpha.team/upload/files/sudot.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/54102164539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+files+from+an+android+to+a+macPDF 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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 17428 bytes
SHA-256: fac6e48e7a13ec4e996803ed7332487bd3b6002208d5893c8df408ca63171417
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10712 bytes
SHA-256: 6e8343a349f9c4f9f084c2905dfd4257c03656e4b8a5beb5cfb1736b293cccfe
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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