Malicious PDF — malware analysis report

Static analysis result for SHA-256 a631f12fd337bca9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 05:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7a8772f222a65643585375f20dafc91 SHA-1: 10d5042f8205229535740b544c434a3db2cebaa4 SHA-256: a631f12fd337bca980faa109f07a99480498dbe8fc96b0f46411473f64447e89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, many of which are hosted on disposable domains or utilize WordPress plugins for file uploads. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://thefertilizerequipment.com/d/files/21435603708.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ec8e5fb7475f6873b21c02de2be87d5/17478971341.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f9b8836075a624428a5ff56b6f357381/36164119116.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e36175da---fidofitisex.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7154dad6aeb92217fa1a43f46291b4d6/22141271410.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d008219059f---53293436070.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b5d10a858---94805869537.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfcbd1d1f1---29068585099.pdfIn PDF document text
    • https://alutat.com/data/file/gosofeg.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e9c91f12---polenivubi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/nudatozirekatasozojel.pdfIn PDF document text
    • http://ecole.ru/text/images/file/47900898452.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210803063307.pdfIn PDF document text
    • http://hevolta.com/upload/file/92883316370.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/fodatadugesawuxuri.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/webitozudexez.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab451f551---86650014254.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0acbeb15---37310025504.pdfIn PDF document text
    • http://premium-h.info/files/files/rejetalenibenibak.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bi8m935ttpnqp86ale95r907i0/67572873510.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/67818333261.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/18152222555.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610102a0b073d---21138154879.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/53251711207.pdfIn PDF document text
    • https://rosycaffe.com/file/67810223602.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/fukodegaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=v%C5%A1eobecn%C3%A1+a+anorganick%C3%A1+ch%C3%A9mia+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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 11484 bytes
SHA-256: e49786841db8aaa83f7dd693694dfdf0377478165c25e2e60eff58c8c949ba28
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 21684 bytes
SHA-256: 6446435b1096c9d30a3b7cf4f6721c4aea7b0e2779bdb3a23b28ed8cd7bbb881
font_02_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.