Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053b3273fcb8aad…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 08:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 405680b0d1c84d330beed9f5d26a51bc SHA-1: b15fcd59cab343412ed66b84f34d989da482f9a5 SHA-256: 9053b3273fcb8aadf3b9e2fb222645ba2a65dc2ac9cb04d03feeacb351a6c533
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tjpapigroup3.com/contents//files/28580975845.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8bf6521816819a34613e9818efa89dfd/70703276644.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3i4ae97o9pf7g11hkgv2mncc5/56329917464.pdfIn PDF document text
    • http://calisnt.com/uploads/files/22057329769.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/rakaxokukevi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fedogiwolasuvipawijagoxiw.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/potopudez.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0596900001628039975.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/mazaramoneronanixizizi.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/kedimugodopagulibivisima.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/7167749348.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/99116538267.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc44e65b818---83149880421.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/vidagizifetasuxewifuvuno.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce14825216---ruxewozologanezoj.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/64c6fca15f887a685722ed85ee8ce6de/fopazinekijowefep.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6130337ED07C6.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ff24a08f476---nopenalonowematekafadope.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97bbcec5a---rebexaruxureje.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210815225952.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90566ca065---ginijazuxim.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0urol9qviceoq38sp0vcttel35/gijenozogobedunopabuduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=interface+grafica+java+eclipse+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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 10824 bytes
SHA-256: abebb16384077fb4557acf33b723982e2ce0fb2cd019fa8f0d0b2821d19f7bad
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 19228 bytes
SHA-256: dbf4b21f6ba14506ee8fe1b3046558aa34b9ccd0c460e114e9271c4596847cc6
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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