Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d478d1a7f7fe20…

MALICIOUS

PDF

85.3 KB Created: 2021-07-16 07:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b494dd3a5635027ec5bb8289d7bd9fc3 SHA-1: 5f30e68d7915bc022cccb994e26418f5fa0bbdbd SHA-256: f9d478d1a7f7fe2018977cc2d2b8a0086465de26c9ed9e83f472d7b147e405c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for 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 0.9964

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://drafthe.ru/uplcv?utm_term=design+of+electrical+machines+pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/67142722811.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/iqhqu07dkn96jq180f5fe01o09/wevupubukejopanixete.pdf
    • http://zhengfutz.com/v15/Upload/file/20215281618472619.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a693792d27b1fc203fdcbbc8ab7875e2/dovopudugomogoluvof.pdf
    • http://karpatskiles.ru/store/file/74908538153.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb1ba3ff4---86589153822.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb94f238c57---33784477097.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a6cc7d71---mulelowe.pdf
    • https://accuratesearch.com/userfiles/file/piwux.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a56387341124fbbcd90307dadb2dc909/1445783742.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/28258ff779f1d12449a6bfb27fd34ca8/ganabi.pdf
    • https://afayl.com/userfiles/file/milujigi.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/982b9b93f718735e1d0e6cd85518ab39/rawoxobozoxolipuwa.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0821b4f0d---66747185285.pdf
    • http://aircond.md/upload_fck/file/54829134467.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/28ae5aec3ff1b16dfab01b142a43ce47/33544661591.pdf
    • http://extracam.es/app/webroot/arxius/file/55385365619.pdf
    • https://burgas-remonti.com/userfiles/file/kemafajekosekedusinuwazu.pdf
    • http://megat.pl/uploaded/fck_files/file/88939607307.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086978dd4f2a---wiravabiruguposuxetetivo.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/99708140844.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xarolu.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_off0000e838.bin
b88054562823e51e0dd7f80cd38198e2f7e76b869fab85a256cc5e2b76fc0e42
pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 17112 bytes
font_01_sfnt_off00011522.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 16792 bytes
font_02_sfnt_off00012d39.bin
d07c88dd9c6f7e6ce82f33ca8817850819730e198de4cead14daae4aaf187008
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 11068 bytes