Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1d7de545c90147…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 19:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28696c9c5515b8185939e34b5bdb1e0d SHA-1: c3351ff1c10797a535da665fdc1397e068e57f1b SHA-256: bb1d7de545c901477d7c738e0b2b3437f5160ba1bb45fc7ec6eafb11dc5b618c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to host phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to distribute malicious files.

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 http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097980ce0cec---62128748487.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/70218633778.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0bf11ab4d0273c4e12681b8742faff34/pozoterupatuma.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/tetowogega.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc112c0e4f6ddb7bb3cad7161d69ab6b/sizagutifurozaxo.pdfIn PDF document text
    • http://ned.ru/uploads/files/rafavagosinujugivoxi.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/59558179028.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/jifojajobit.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/velizileka.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d58f3b2f1e238980467a581ce516bf76/koxuluvasibawopabodulidis.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/20217471440.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/walaforojixanazowidegunij.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cb67ee92---waxenuwezanepojarip.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/40469718103.pdfIn PDF document text
    • https://asiabiru.com/contents//files/36259445035.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/0e7bb8b3a2d2db4b362f559c6afde776/lerus.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/45778713012.pdfIn PDF document text
    • https://adikketiga.com/contents//files/31262714119.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/0e9edc913d7ac988c4a38dab523917ab.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e0868b22282d8abdd734fa47af6ffd49/jeragizalekelejesopozonus.pdfIn PDF document text
    • http://fruitvita.com/files/files/41157338816.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e94a63546fd---togelamimutelapomo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/nodekokasoxarejotar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sciatica+physiotherapy+pdfPDF 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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 10756 bytes
SHA-256: 8b46ccf337b78d90b3dbcbf0aa6021fd7e2302c55eff5aa4aea0c94217cd34c8
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 16896 bytes
SHA-256: 47e9c6d9d1d7f69f0bbb4805f696000b9d4c31d8750dbe256dd44019381bfc37