Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d37cab40888a6cb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 02:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e630708a0d3db15bb886e0a56ad01f1d SHA-1: 4fa77d53e86ec34946f2dbf64e23a9f787cd1940 SHA-256: 6d37cab40888a6cb28f143f01e60604fd9be90bdd1708609537952d5e8db1c1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the link farm nature, and the presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=minecraft+pocket+edition+1.16+seeds PDF link annotation
    • http://bdsductri.com/upload/files/39478114593.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/juzujadafanaru.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gevilorusipukezevi.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78750029542.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161385e6236d39---61362340018.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ginibumej.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/wuvujaxivebuvowude.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/28193567578.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/tubinobujolux.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/68527962194.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/78113195571.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/raxomitefuropataje.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/7316476878.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b820e91283ca969504bd7451a1189b0/zopavekabazaziwul.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/8598399253.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/11189053176.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/wegifiw.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138fcea57372---mesar.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/39110974581.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219161322466860.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/42499321308.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_CD8F27E1C0209B37.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/82095821156.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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 18292 bytes
SHA-256: 604adbf2f17fe627f05fec7a3506c6a6def16332c2f2eabe8d82bdb43435c891
font_01_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 10936 bytes
SHA-256: 45954a4f347d19414c8c1bbd3dfe87b44ffd024ea5bed64db4220a902d33e42d
font_02_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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