Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d7a5f83da490e…

MALICIOUS

PDF

92.0 KB Created: 2021-06-30 00:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0626ba3042e4157ca83d87de786ee437 SHA-1: 6f828452914ebbb38b20f5e3531b3499c4ae6067 SHA-256: 6f1d7a5f83da490ed35159f7f7e01164d9c0fbc9bbd9f984f95f505fa446d522
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=typhoid+cure+time
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6d876922---60921232622.pdf
    • http://anbao.vn/uploads/userfiles/file/bolawapo.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dd582e019c064788fad14f1ab165c551/zijosufa.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/au7v5d6u890925l9hs6iaisvrt/69956114292.pdf
    • https://bandotrading.com/uploads/file/runuv.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a10d3d82b6f30dbdcb8dfcad6ad431b0/dugejosarabakilorebege.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/ba2c976ba39f64fd747399043c12ccbe/gafebobor.pdf
    • https://businessservicesuk.com/userfiles/file/57309022781.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072582ca9528---jibumi.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/94130097853.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160802457c2a20---wajaxojina.pdf
    • http://agataklimowska.pl/userfiles/file/85725741003.pdf
    • https://vestol.bg/files/file/logunajupawimo.pdf
    • http://soflocops.com/clients/67403/File/97446679448.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/91d00a084d44bf8bb3e4342e6a0ee457/lajobarogatekazane.pdf
    • http://etasystem.net/userfiles/files/48993932939.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q47m09cr0plnsvab2r8t9k5rb2/76832128299.pdf
    • http://lyzjkgm.com/d/files/51154128255.pdf
    • http://serextion2006.com/js/upload/files/jefaxa.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/121u672fq954k4prd7kut1tl07/29420323862.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0f387183---zokumopovulota.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6465c1e07b---gomitolejidulowatin.pdf
    • http://alemotta.com/resources/original/file/verawajoj.pdf
    • http://alarcon-v.com/editor_upload_image/file/xiwalikiduzogapixeposiwa.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_off0001039a.bin
d714b6c40a8fd5fe914386e30b64c8d8394e3d90d025d703f41130f77e589846
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10476 bytes
font_01_sfnt_off00011b73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16792 bytes
font_02_sfnt_off00013385.bin
cc40296b75143de499137b8087e1312028727693819874eee65e59c58688b71c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 17524 bytes