Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdf26c84cb5f570…

MALICIOUS

PDF

78.0 KB Created: 2021-08-29 14:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a1ed626bd463823572104772f0f3b5d SHA-1: 65ac900fb9eabdeb0c4628bdb8551925ae118b6a SHA-256: 1bdf26c84cb5f5702035aa47a5357effae2d19e0d08c2248ca87e9cb7b438c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics confirms the nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://glycocalyx.nl/userfiles/image/file/wafazinogemiwiwoxelikom.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7bb50e43dc043490a1ff3bbca8683a67/jadiwaneranulonotimonowe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35af1105d7---99077744690.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f744100043---dotoro.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60EE05814CF71.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/garuguvuterudew.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1ab63e037a57af552195ff37d2f14e72/24026801015.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/87991094363.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/xumituxa.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/jirudagubeku.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c2615cbe---59447742739.pdf
    • http://jngf.cn/files/file/jegaxovilena.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116fee1b74f1---95519943697.pdf
    • http://maslatalaia.com/userfiles/file/57837328570.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/af00afc674fab19c678f6516c4165b5d/samigowi.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d8c768a1950fd1de4d5a47743ed53e3a/zafirifuzeduliji.pdf
    • https://unosms.us/userfiles/file/wubetutu.pdf
    • https://hyosungulf.com/uploads/file/62372602204.pdf
    • https://bearings.vn/images/ckeditor/files/jubejixifemojetozuf.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/592314a5e7d8b2571168b1907be2a7c7/77717504320.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e5417dfe---31616686239.pdf
    • http://vuatoyen.com/uploads/userfiles/file/bajutibopiwizelatew.pdf
    • http://imaginove.eu/data/Files/litixozajulimamufav.pdf
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ionic+chemical+compound
    • 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_off0000cc9a.bin
92ec94901815fbb8f89de1438262a4227207d207daa72a25d1222058822899f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 17864 bytes
font_01_sfnt_off0000f9ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16792 bytes
font_02_sfnt_off00011216.bin
439b161acd5e8097cfcc5c4d732bfe2282d4f16ee9dc682f0f849e29a0eeda48
pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 10464 bytes