Malicious PDF — malware analysis report

Static analysis result for SHA-256 d961b52c7b47e1c8…

MALICIOUS

PDF

73.8 KB Created: 2021-08-15 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4e97295434dace9e5284b6edb85b8fa SHA-1: ae14c4a32c1de7d5945cb2fd1d72d436ad6d9682 SHA-256: d961b52c7b47e1c8ec755c5d656bc300278d3058d6f4121bca436f68629b67fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to phishing or malware download pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://octvads.site/js/ckfinder/userfiles/files/fipitarapeduvelinamuva.pdf In PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/betogafanifepefex1622120129.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/josez.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/gawujobewej.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/nojititutajima.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/18617280673.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d231bfdd---nibipabokedifimamadaxab.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/87419580768.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/31375201926.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/8616272991.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608352fa4c616---reroxupekebewavutinaver.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ba83d1fa---kasufegikebite.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/semezodigapafomew.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/23987349971.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/kobajadatozezidesugode.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210725222614.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060ea66b36c---pifujuvipovepanudu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/newevinexuranegawavanupus.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a833ab92d01---8711605391.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b061845e9ef---xugopozuxatojopuxagokana.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea734214f2---45180222886.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/19595348065.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108bfbf12e03---sorobewakimofafap.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2367cfaacd2d118242f29c2d1eb99b4c/14271623962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=felizes+para+sempre+-+kiera+cass+pdf+gratuitoPDF 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_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 11120 bytes
SHA-256: 1e3b25c7cd323efa9a3a427afb0942d50172f5741320195a4292b9759897dad6
font_01_sfnt_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 15844 bytes
SHA-256: f3cae1d491c1e7b7549fbca3d7bdaaf81d4f3704f9fb51d5be89ee268c06b626

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