Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7874b54390fe72…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 04:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1311e052c0f3c61be4a52d70f5f685a SHA-1: 99977df897c2b86b906a31531f5f22783ada11b7 SHA-256: ec7874b54390fe72abb70b8c1db35b7936e0a08c631d16859b219a6c30c26f7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised WordPress sites and disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this document is designed to lure victims to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=culturas+indigenas+de+mexico+pdf PDF link annotation
    • http://muntepa.com/userfiles/files/fepikutenuzorik.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/49886780942.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75dd7cd46e---48205587702.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1gb9jmt3l8ebqju9bnnq31egib/9359772338.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zigaxodudelugimadano.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gogafeguwedomiluka.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e48e63111ac---nagamim.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/16616773293.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/83597592079.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/38040424991.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/wotunofeba.pdfIn PDF document text
    • https://kultmotor.hu/images/files/97254330317.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/tubanuwitad.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/1445297326.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3bd14db---21131741435.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/simanefeboteja.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78eb9a37fe---44534361582.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/kaxexejemasosedozekesela.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/79128913034.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609402a80baae---nanujapozigabiponilemuve.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/tafitomu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/2761764191.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jutulaxiti.pdfIn 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://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_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 19388 bytes
SHA-256: ab091552eb605cf5b8504a504356e2f95b994aaa8e8ff4ff516941df0ce21d7e
font_02_sfnt_off00013276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13276 11196 bytes
SHA-256: 1ba8fd6c4ca7d065f998098f484fb1b671d9475b68edba4b74021274e7326d6a

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