Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad4c4e14e34400f…

MALICIOUS

PDF

76.6 KB Created: 2021-06-28 08:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 922d226e5b5a202041959b3e045a2096 SHA-1: a7bae2729ae19c228bd108234fe1264a8f7f41b4 SHA-256: 4ad4c4e14e34400faded72bab691980bbf985c445516600e666c8968ec3016e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=mls+scituate+ma
    • http://fritz-fahrlaender.ch/download/77315342213.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608023e74fc93---84910380377.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdece5c49---fopubuliguj.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac82c8ecd---48544224787.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7f37a837b4fe712d9311970da4aa1733/2667120157.pdf
    • https://synersys.fr/contenu/file/saxim.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfa6dd29d---29137845817.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/td2ujab1dmak3lddnl5u0cfesk/rawaparamefujefovimunore.pdf
    • http://gsprojekt.eu/userfiles/files/7075264341.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f1039e5a---44897565673.pdf
    • https://lescourailleurs.com/upload/editor/file/mugotosuviberururowireno.pdf
    • http://www.toptehnik.si/images/86397307787.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c83994e22---32367797299.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kubelibadovabod.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vup8i0k5k3t6c2m8fvjvnhaa24/dixomukomepunake.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/242ea5282685ed8f8f40dfe3989b595a/ziwegunuvafinugenediluda.pdf
    • http://gramercy-grand.ru/files/file/xunud.pdf
    • http://www.allatpatikapecs.hu/images/file/zozasotixonorod.pdf
    • http://reguitti-engineering.it/userfiles/files/75165120993.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608561416d871---sagovu.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c450d73c7fc---6522016479.pdf
    • http://barcelonasixtytwo.com/userfiles/file/wusetimoxamexokawavolafit.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t43v1d0u0ajepte6jjj3pa2nbn/58837513952.pdf
    • http://backupcenters.com/userfiles/file/nuvedomu.pdf
    • http://foto-preiss.at/upload_files/files/zijajevagema.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_off0000cbc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 16792 bytes
font_01_sfnt_off0000e3d9.bin
fa4cd5f6cb774651eb427e6fad7b9b2012369fd01f74570095a0bcf21ced0e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 16440 bytes
font_02_sfnt_off00010ea3.bin
ee61689286694d59a17fd2a842c852c8e37e5c93a705d39e6f95ab06368049fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 10160 bytes