Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1b831766611e32…

MALICIOUS

PDF

78.5 KB Created: 2021-07-15 09:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3590aaea16648a0e64cdb28c2d0decc8 SHA-1: 7a5db1b0299be780fb9639dfe11a52f1203646a3 SHA-256: eb1b831766611e32d4cd8bad3e66dc0bfb3525050bb179400e0c2c41e2affa91
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, presenting numerous URLs on compromised or disposable hosting, with one specific URL pointing to a password-protected archive. This indicates a likely phishing or malware distribution attempt, where the user is instructed to download an archive and then likely use a provided password to decrypt a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://karinbentum.nl/uploads/file/kesiketupalowikivulaxal.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9e79ddcb---gedejutududunowixixawawi.pdf
    • http://northcity.rs/slike/files/51368169615.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e1038aefa---ruziveduvefomolokatafuti.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/28236591693.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ddd48d1607fb9404083316fb1baebf12/56206219947.pdf
    • https://rimsball.com/ckfinder/userfiles/files/lasubeguj.pdf
    • http://snotlicker.com/clients/10243/File/durososukovi.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibif1u5e3bdom0eo5jpkm9bu7p/vubimojejaka.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/02fe91e11b66efecc56f6fad1eb09ccf/7970828274.pdf
    • https://locoffice.ru/userfiles/file/33938381559.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3619aa95---46949207529.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987eed5b1d6---46562765501.pdf
    • http://amirafouad.com/uploaded_files/file/bosonowofavonakogufafivu.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805231ef2f7---37596276108.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a401caa7bab---fetetixikimezi.pdf
    • http://ambvet-trefontane.eu/userfiles/files/nikavokub.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/47767547273.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/cqahtj4q8lgpo3pefnithb5nc4/fifelu.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/nh7mb1ne5ajhdjh9vbl09smjue/pevisofinu.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9381a5a4---55038519446.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c022ac61338e3d5d282117705f1a9510/bizixokowixazit.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9c42b0d8b965018e1c62134c43a271d1/72885126162.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f077574b12---5049460149.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7d416170---89457198163.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723dbe4006b---20249992521.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=contract+killer+2+mod+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f0.bin
e0417299bff2a06e9c071ea0227bd792d558b4b37cbedf002c4c0a419d317163
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10836 bytes
font_01_sfnt_off0000eb0a.bin
d37e194a729a78172fc228382ff216eacad43229847a6bf2eac829a44c4dbf66
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16108 bytes
font_02_sfnt_off000114ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes