Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff098abdb11f71f…

MALICIOUS

PDF

90.4 KB Created: 2021-08-03 13:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a9b12e8c994758b2e831d2b79511c356 SHA-1: e576f68dc5e1e2af31137cda1106f10cad112e01 SHA-256: 9ff098abdb11f71f7d1677e51d5550ffc187e3f832af2587cc9271ad586ae604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF link farm heuristics indicates an attempt to leverage SEO or redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ffe3b498---pobusezusugosejuxab.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e6f4b547---83837553336.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tprruueiiji47ps2dkp4cheo6p/30248858667.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54da17dac---tubepi.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mv1idvaf069a7mimka5l4g4i32/zoxapo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/29j1lslrm9m364a6esmtrpk5an/fusaluxiwodomadadive.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/99813956396.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/lekuxabexululum.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210706150424184.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6cc287a8c537e75a65d2f23f0b6821f5/96747555504.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/femisebonadawupabefofaba.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9515137f---nujuxuwixusovo.pdfIn PDF document text
    • https://seerupit.dk/assens/file/feganexegejazefa.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/92857254409.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/84811023850.pdfIn PDF document text
    • https://iwistw.com/upload/files/3695812526.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c723366ca3---61782233840.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ub8aftq1hreg2qc5vtqmbbtlt3/58051319642.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/3685468231.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79a8990c0b---ketijiwopoxefoliwu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/97388905682.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/fozemiwufefide.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kuremoludetugoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=animaker+full+version+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 17284 bytes
SHA-256: 45058a94b3dfb15618438db240252840e58d3ed26c1117e11a3ef67629055fd6
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10636 bytes
SHA-256: 81ea865bdc4f559d0a33282183a4314959f73ec445780425096c2a6e558db478
font_02_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 17652 bytes
SHA-256: e9d8ae7f50096ae00b928f5ac4a6771b6eacd9e765efa54aeb8ddb6c6fdd1b01

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