Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1f44f9a0411d5c…

MALICIOUS

PDF

74.5 KB Created: 2021-08-12 17:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dac514de203b6710c6da067f26d41aed SHA-1: a295aa1a8eef87b5268360b555b435936395e551 SHA-256: 2e1f44f9a0411d5c574480278e7d2d23564d560d7448763457ee019338feeea6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://digireg.pl/upload/12452534794.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pe39pvi5qjlbftr8cn5crrvssv/xulitogu.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/novuderorenenagalobat.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/lededajupuf.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e00ab3827---64935175538.pdfIn PDF document text
    • https://peterdegendt.be/file/48433070280.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33953285493.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/63524681739.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/vetepixupo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d93856bdc---67469276665.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/33392755536.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a7b91e8b---nobakaletepabavebesulari.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ee53aba7---15508264877.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/mopudefemipa.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210714_14AB3F0B95D7CF23.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/dosesalofisakimepejuku.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f1b06a308---jajuru.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160710e28b597a---pewaxopakisobodotawejix.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b893d535edf0b06575df13ea8e1b0a79/xurobepa.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/11842011076.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jivuf.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f429db5cfe5---mewexisodubijebabuzisiw.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/32826536874.pdfIn PDF document text
    • https://ive-cal.it/file/14561593912.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a950b178---65151468941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bhola+hai+bhandari+bhajan+ganaPDF 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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 15840 bytes
SHA-256: bc42848d8a4b851ef9b570ddc5b924b5322d60a2d480829c0235567982d367b2
font_01_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10452 bytes
SHA-256: a58174c278d7c7ec53670c99fe09da3b78d4b2263cb0089ea4a0e5b14aa70495
font_02_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1