Malicious PDF — malware analysis report

Static analysis result for SHA-256 716497f472502b42…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 05:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d29e7b016cc4b88fcee25f61fa291b0a SHA-1: 380209b376e1dc4744d1cfb5c086211961d8d8ef SHA-256: 716497f472502b42a46d6b9eb3e845bbe8c53e8ddee4b4391b94fa36c34019f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The PDF structure itself does not contain readable content, but the heuristics and URLs strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nomylo.ru/uplcv?utm_term=statistika+smk+kelas+12+pdf PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c796382a03---jejedixipiw.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xoboz.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/taxevaxelorebukig.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99cf574a1d---kolas.pdfIn PDF document text
    • http://poliinc.com/upload/files/35314848981.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210813150655.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9pnuh2nm7plcj212ckb0jbndq7/66996599046.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a361d6ab57e---30404035475.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2a66f3c2---50459839799.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebce4db1c---biputosolatebej.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0712e39705---84993616781.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/62941944433.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/27i31ogd7m1s71nili4jinu662/welojadatuvul.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/40584486055.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/l8lpng5jlad0a1r035ph1lq5u2/32303247588.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/37515530037.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/51725391286.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3i5bo8uu3j24idu0ufrmci33e6/fomoreger.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f0f9f02c793d8d11b0ddc5c24d0b26f5/72834074268.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/pikobibafowari.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9241ca9f---31797943602.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/8025996010.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/7561815223.pdfIn PDF document text
    • 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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 10676 bytes
SHA-256: 1d0399cf3265addfaa5ed5277515ac649273a6420b348d4f9366cf985c508971
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16664 bytes
SHA-256: 244e874736b79afb221b7c9da0fa152d07fe3be9ec971b6777bdeac082b2fc45

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