Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2638be7d200260…

MALICIOUS

PDF

87.2 KB Created: 2021-08-23 15:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5ca98063bfd9641efef7627388cbf21 SHA-1: 1ddca005d88ddc3f92969116eddaff44c49c9251 SHA-256: 9c2638be7d200260f44810835700623163b3067e309af695fa86c9f3c8556b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure for further compromise. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://5udua.com/contents//files/fizuvelekebifapotavitoruw.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d117ba08d231b470a1454a304baaaf86/40371974241.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d837d3066b00fee8ce703ffe1ccf5cf4/zolobobereliretadamuwef.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab81076e5d---vugosufigevutana.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01da541b8---94353374892.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/181ee4aca784afeaf4d153ed264e6bad/78298584749.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/97155358667.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/13282318382.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/71308881444.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/wudufefipuwanileb.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42608f98c---xopisaponiruroper.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/56146392943.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/64365707353.pdfIn PDF document text
    • http://naoshima-habitant.com/8439383030.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/2572563151.pdfIn PDF document text
    • http://blueyee.com/upload/file/092201208864.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/23636083713.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/as9j5fhur5140f8t661qn9ite2/91495071204.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/88485819553.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/51a25a55f2daad2b6a3534768e934d8e/vupumipikijovewu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/xogezufipikuguku.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/45217644070.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/waviwonowivodexofimur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=oat+flour+muffins+with+applesaucePDF 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_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10956 bytes
SHA-256: 1aeaca6eae1e9101f81c716cadfcd233a3b17c7d807ec0501ccb0af519477ee4
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 17696 bytes
SHA-256: 47785313f4673d191cfb83c1e6198f877cd971b26e25ac23f7535052b0b37e2e

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