Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeea7531e7dcc582…

MALICIOUS

PDF

74.5 KB Created: 2021-08-19 19:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bec8c21e565fb6d867a720c72be344d SHA-1: 8fae1de80c63c13cd5d9ea851ea5832d71e3e541 SHA-256: aeea7531e7dcc5826607ba02d591b046fc2e445993204386c4e4972424d60532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates the primary purpose is to lure users to phishing or scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://krisoc.ru/uplcv?utm_term=sin+senos+si+hay+paraiso+2+temporada+-+capitulo+57+hd
    • http://turinhotelcompany.com/userfiles/files/34492705732.pdf
    • https://aslimitada.com/userfiles/file/netex.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210817_18B04750FE32CE03.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c4bd97de9b5c14450c0e49bfa5b1ab2a/lotizelutiwaxivafabigiv.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdf
    • https://jcmimoveis.com/userfiles/file/45936638495.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/pusokokiwozoxikamo.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea23235b56---21460532402.pdf
    • https://menu2uplus.com/images/file/siluwonixiwojojopirovugi.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e59b32048---lemikapagojapa.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/71220761217.pdf
    • http://alnadaoil.com/userfiles/file/moguwowepafedebezasi.pdf
    • https://alternativecarrepair.com/userfiles/file/18034307558.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d422a67034d---tixadaradinozepil.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7b1cdb7a943a15f23f227c6eff22b3ab/ziregaleku.pdf
    • https://diaochue.vn/userfiles/file/79862284795.pdf
    • http://infinivideo.hu/sites/infinivideo/files/94167110555.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/jitikejon.pdf
    • http://chpcentre.com/files/file/41434450394.pdf
    • http://sevimticaret.net/userfiles/file/29655101992.pdf
    • https://asiajitutop.com/contents//files/pidedijopol.pdf
    • http://islandpointfl.com/userimages/48364431099.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8bccc594c99b2790e1210521d23173d0/wimusepuzufiza.pdf
    • https://gaziemirkentkonseyi.com/upload/files/81089394503.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85303e5319---85789445415.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kcqohdcuut5luk6t1ub0br1glh/zoxabuzusivogiberunot.pdf
    • http://ccforum.kr/uploads/file/1621753938.pdf
    • 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_off0000bedb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDB 16792 bytes
font_01_sfnt_off0000d6f2.bin
73c37a8e522c975028cadc51add0d09752c64be9982da0d718c2cd79ee958aa9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 11404 bytes
font_02_sfnt_off0000f1d7.bin
b234f1abe7c367e7a2ef834b75a4183fba59b85181a646de2e9355c703a3cb91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 16604 bytes