Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1229e65d2024d1…

MALICIOUS

PDF

93.5 KB Created: 2021-08-08 23:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb0e0e5f779289cd89aafcaca5babab0 SHA-1: a8508dd864146ac397d10fc51f87e742065dc394 SHA-256: 5c1229e65d2024d1d61d9663ba904fd81987d491e49172194e2d0903c9057b4a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://indago-rovigo.it/userfiles/files/60973495455.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193e254fa0---20183552140.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/80089503447.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/43182362665.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/90756117451.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q6mr72g5l1mb6cc4qt0j8eip95/webumulifegetodusep.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/64284462064.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed0bb40458---wenuwap.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523124732122197.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/52uiooi5djjlgoe8tjo5vn7ru4/5577814646.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/gevutazefopen.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/bi11ve1298ats79fj0g0hge99p/98650188068.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/62703386138.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/839c296f6be24e1b21ebb080cb99e725/83701967824.pdfIn PDF document text
    • http://accronline.com/userfiles/file/judeperiluxedo.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/tutinatafepebinu.pdfIn PDF document text
    • http://www.520amis.com/upload/files/bodurekopavolini.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb039b3ff---riwexu.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210715_6E050D8917AE0741.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1622656612lotovufumezinezizovaza.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/34263775119.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/89ca3bfc27a6dc58863b7949b4749f76/poguzutusojoxofanosaken.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/4912825617.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/35621652456.pdfIn PDF document text
    • http://kezheng.net/Upload/file/90794658256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=murach%27s+java+programming+pdf+free+downloadPDF 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_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 17648 bytes
SHA-256: da4d25a1508c44a1947c1914f369412c9faa44a1254433d0eb7110d58d6641f2
font_02_sfnt_off00014c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6E 11376 bytes
SHA-256: 6b236beee0d713d6058cf6e60e47dc8c207b2b4d6299007c1d6e977522f9d018

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