Malicious PDF — malware analysis report

Static analysis result for SHA-256 f633f411ce4c2fbd…

MALICIOUS

PDF

91.8 KB Created: 2021-07-16 20:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 176a0d8082b84afd4b26706bcd5d6c03 SHA-1: 7aa9e9b2d1e728d6a99d112785689c80233c1a0a SHA-256: f633f411ce4c2fbdf15218d973a66ddc9daedd4982278423c077d61de4ed7333
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c43f83554a2---94193434688.pdf In PDF document text
    • https://augsburger-dartliga.de/uploads/file/45378481248.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbe3bdbm16lg9kptfupl4qu3s0/mefofemeroxenuto.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9992e99fd1---92661756793.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210705_442DDDCDB59E7E5F.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zadejutuxitu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cfe19482ae204856c79e3d183d3a6805/79732655059.pdfIn PDF document text
    • http://mp-journal.com/media/file/81636476598.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0178isucbarg376qvmfgck6rn0/fabizev.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pmvh2vg6hb2mmasvqjohl02peh/wibimewox.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/49385939207.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/8845463922.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f640190e21---tigeka.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021514123658458.pdfIn PDF document text
    • https://wagaskar.com/media/45328085635.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608572902e7bc---bunikojepova.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/1328434368.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/32580630804.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/64199866531.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/serafebu.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/wikuwa.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/52404816077.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/telizinifap.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xejubujemilozezuxim.pdfIn PDF document text
    • https://keongracun.org/contents//files/72664842683.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/bewusukigiwodiwajegek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=black+heart+tattoo+collectivePDF 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_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 17076 bytes
SHA-256: ed096b957f0d4f614bc85cc45c670ada25b0d9578e2173a120707b001c27d0c2
font_01_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 10268 bytes
SHA-256: 9c337489401616158fa38d14143eec142cd38779e050db8589f3f9df916dc34d
font_02_sfnt_off0001496b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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