Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11b2e4323ee74fc…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 17:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4fa0cf5892473303ea1b63be7595841 SHA-1: 2859497cbc9372fe1aa95a9f169651e46d5d19ca SHA-256: b11b2e4323ee74fc6b35c5736deb2e65bfb854e6034ff3e3a22245a89f6c2944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The PDF structure itself is heavily obfuscated, and the document body is unreadable binary data, suggesting it's not meant for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=conservation+of+energy+dynamics+pdf PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/mqfk831srbv4p6aib32ljhbhr2/20293901801.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32d674acc---82993516645.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/70322784140.pdfIn PDF document text
    • https://esz.jp/img/editor/files/sekarupuvuminumuzas.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/xaxoliperawososejepoviden.pdfIn PDF document text
    • http://centronegozi.com/public/37887246993.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b0089a8---19854903361.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/cqed32ciddgqcqhs9ne2sh58tn/3775238774.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/usgs1s9h5o93c892i0e4303k66/sekosatarogipized.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/mopulexafunerixelepaw.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/moveripotofudopomegotiwez.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/gufafazuxipuzijej.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6619d61ff05ea9d5dd0ff4c044e0706a/32115876411.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/puwidedog.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/50496708185.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26dd3865e6---57190810229.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lekipovamasazix.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/72454934328.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/gabimabisoxo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gtjmop7081416belsvkiho8nuh/tetajakujuworokeni.pdfIn PDF document text
    • http://4bx.pl/public/file/11952906903.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b585d905582---sizanisivorilowosuf.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/nixovibupepunibidodibagik.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vawanisoposiwupujuxagide.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6962d050f6---90645949541.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_off0000babb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 15360 bytes
SHA-256: a9d85e68384c185375c999b516f1de406e26b5f84821dc01d7affa440f0e8ec5
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 11128 bytes
SHA-256: 6b4e274a6fc34880031511a7a946e791f0ce7a113bddf91bd91691f19d8e1122
font_02_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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