Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbb805869d862e1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 15:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a078b9c368393a779726cd209382cb0 SHA-1: 7b9ffcb74a11ad888890c2c9628658b8bf28eee8 SHA-256: 7fbb805869d862e1a3d9fe830404c43713326ba01dca5430c60199e289ec4f9f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites and disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=left+join+multiple+tables+r PDF link annotation
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b5c20947---33694435472.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xekeralezog.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/16354379533.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/43993487fedfa06117da96986e857fe3/26100851452.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bff2c0058---29398939488.pdfIn PDF document text
    • http://cwesp.biz/upload/file/wudutedogidutepigajavidaw.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/katodexewovolibazozisuw.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/44153001539.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/jowop.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519174945386820.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/zixor.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db4c18798---rovugovisuvu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1539_20210605170211.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jorus.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8669b0120---87962230126.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef24ed1a23---liforikufe.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/44340226326.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/bifexodifesilemupevuz.pdfIn PDF document text
    • https://medtek.vn/storage/file/mebonusixiforadudebemef.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde49043605---32410315063.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbfc5e672---39892499774.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a3e5ddbb4953495eefc1939013a8e6ea/tozusazekojota.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wutedagediz.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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 17136 bytes
SHA-256: 75e8130cfd8a57cc1b38b1589aee6572467f3ff2df8ecaddf6de8f116a92f872
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10848 bytes
SHA-256: 45c0db60ad9c996ca546751589432e0ca8273b60d784ec419e98bfc4c557955c
font_02_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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