Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fb918097d9661b…

MALICIOUS

PDF

95.2 KB Created: 2021-09-04 00:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d3f9dd63e16848db99e8ffe64745c52 SHA-1: 42730ef430c4e2f833d61ec736daa51ee7ef77e5 SHA-256: 89fb918097d9661b2fae277200857bfc9e4286ba02dc0ccd1a63523126351ebb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9d447ebf67fd60ca919a3b5df3539398/51961071656.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/60c2c2bde2824958f853cd4d9993d8d7/30202993210.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/53378393957.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a966a504de---dotewatixoguwaviwib.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/54069495700.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/zivivunogipurus.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbb9ed009---7961433490.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/kimitup.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/90164759912.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/vexupubesafedibe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76ad36f1f---nepij.pdfIn PDF document text
    • https://efnnma.org/files/file/nedelumexowol.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/dotuxamodejagujatigisapiz.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fusivaj.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/35265196567.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/koxikupulomebowiwatupila.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c861bdb745a---tunavalokajaxufowew.pdfIn PDF document text
    • http://24cvety.ru/upload/files/difuzudagafatupofefim.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a56365787f98402dc7f4d252b2ba9066/38647831847.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/064b665b18205c9febd249f7a3eb0d03/40180836778.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/57124834172.pdfIn PDF document text
    • https://5y1.org/info/succession-interactive-bioman-biology_1_b8e489.htmlPDFIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ecological+succession+simulation+worksheet+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/511cce6f4feee361a2774898997d8332/97002174029.pdfIn PDF document text
    • 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_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 17200 bytes
SHA-256: cf1310e14648d87e6b766ef064299822248f57a3589862e1cc009e1b3d1e6c12
font_01_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 10936 bytes
SHA-256: b101eb0df68a69861f0ba0279f7f36e418b9686d401740911c1ac7f5b3c6cc2c
font_02_sfnt_off000156bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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