Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c37ab1f33cba3c…

MALICIOUS

PDF

75.1 KB Created: 2021-06-14 10:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5716a7b8d9b5c9a08f6e549c3baea0c5 SHA-1: 6881010f7e95a1f2d1ed146befd2a7aed4d4c48b SHA-256: b8c37ab1f33cba3cf06b1d075ff49e208f8ce126ba70462776c9f07d4a1e2309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download content from compromised WordPress sites, disguised as a free movie download. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=zombieland+full+movie+free+download PDF link annotation
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/km6bk6g2r5jm5q845744jdn1d5/94819962623.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/70982794f2c6e2fe7f2cb86bc4489a8f/54698970721.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb197ac4fb---pexunupodiwovetinutineti.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210610_133843.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/jujjt9h2p8gfiufjbn37hqvbp6/65212503729.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/23967102216.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/wemeji.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/qf4knoisjii5nkb3g0lontt2c0/nerujisi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431791dad7---68312315451.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61bdbd084c---87462667000.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/28t7kcq3s9gj8lourvvac8qu0d/10372068974.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/xinutuzedolunoliliri.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/sojujazak.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1269250bac---xopigi.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/pafojefekojiwegu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/phectnn6fb0ef10es65koev7e7/88264303962.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34620cbcec---vuxejezomoxobuwidoruvakog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 5124 bytes
SHA-256: b63dd5b6570aa050fc2cbc96f621caf2cbdd742a5ed366996a4539cef50ba045
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 10732 bytes
SHA-256: 4237d9a1b2f6a21ab071ee5469ce79b6505bac0139f060f5c242087bd486ca07