Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b72f49123a149b…

MALICIOUS

PDF

162.1 KB Created: 2021-08-16 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e2de43c7a0413751c02c035d37aef51 SHA-1: 90872199c79f4fec99bad2736c3bf4edb5420c55 SHA-256: d2b72f49123a149bfbd9c436c09dbff929cb4108122f292dc37ed11e5f178c9c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites and disposable hosting, designed to redirect users to potentially harmful content. The embedded URLs and the PDF structure suggest an attempt to disguise malicious links as legitimate content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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://elearning-chemistry.ro/userfiles/file/wanavegatudutidijan.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/66145199495.pdfIn PDF document text
    • http://limoride.net/gallery/file/xojezuxiguledorutisekidul.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/notetebanubegi.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/33285650232.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/a01a4031c5c2350c8a17d2b55f3fe83f/zazokulizojuxuzed.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/94703661412.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34862059817.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4onedduaj87l0qaasibpmonqhk/kejidizazazep.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/q11jdvbhcr3g2l3npmntglcjv7/78946518522.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/nuzan.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9faa68f26f65db94145a0053d209df58/62819818456.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nikoparuwilivurizagadej.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4330b39f50---sobisipojikukufefijad.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/dijejunujimuj.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/vumegisikim.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/kexafukununivifajagaz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5e77e809fcb966d56710ca3015ae3159/datiwurelumaxosoroparivu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/20752799401.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pefakokixilojusezuxo.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/60279551134.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/nesoxirozatebuxojaxoj.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0801bdd6be---41769517200.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e512a1973c---35602057257.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611217b351410---31677913249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=las+cr%C3%B3nicas+de+narnia+pel%C3%ADcula+completa+online+gratisPDF 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_off00020e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E84 21312 bytes
SHA-256: 9559e0c549c5094853b3bb0ce2e28dce4da364cbf0934cadc15f562de7ddf5f0
font_01_sfnt_off00024435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24435 11116 bytes
SHA-256: 89c0dc0826e34802cf26c24434a8905b04aa057a3a0dd1188f9e77dcbab80dd8
font_02_sfnt_off00025d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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