Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5994812383e415b…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 03:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c222d06d743b7cf3f297945cf4814971 SHA-1: cbebea2035a087f060f752600e99a63be6a44c82 SHA-256: b5994812383e415bed35e85e536aa551757592bbc3931818ed63dc42f23162b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5112272a9---wazusowox.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1900c0683---1572429972.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0915bf315---nediwafezozijav.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/feee0c9f1b52e2f44ca946591bb9ae88/zutuxinuxibimuwo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ac68762---17446486446.pdf
    • http://canxetaianhduc.com/images/file/74662784229.pdf
    • https://pet-fashion.ro/mm/file/11394169595.pdf
    • http://morgancountyoh.com/userimages/tatapegatosujina.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160977fdd05677---fapateko.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d9d4060a---jobogatude.pdf
    • https://hohsingfiber.com/ufiles/files/lurirututigimekewipe.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924d3d2427c---poxekagesovobet.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9229c502ef---gotobagekap.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57bb429d46---1027203317.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba7a1e249---54366612723.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/49d8f033d7a815a55eb3927f474ebc66/18446586805.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790b8634d6d---fesapimejiguriwadufagutab.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jeufr16vqiuljcqm77u4ii12e7/nalozedibalogi.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/er8beme0t34vv13ea24asf00g4/97517987668.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d23917d5---zijenunotanij.pdf
    • http://kapli74.ru/upload_picture/tijepaxamiwilutufex.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863752e9c39---38546883495.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/mgmhprii23vrhe9irsbhc2lp2q/wewarogobujavanadaj.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866fc61deab---rariwokejiw.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/369d3ac8318e9b9a173f844147dc6983/44596010647.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=calculate+area+of+an+equilateral+triangle
    • 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_off0000e4ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 16792 bytes
font_01_sfnt_off0000fd16.bin
16deffd79974c21c86830986aa7b148fa599c57f0ed56a77b271eab8e34af0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10620 bytes
font_02_sfnt_off00011531.bin
8dda8e7a611c6641c37d96988fa7dcb1b84f3c5d51982a539563266df9265053
pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 18744 bytes