Malicious PDF — malware analysis report

Static analysis result for SHA-256 55963da454eb897e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 16:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ec2c0d0978966c9c25387eefa45c6e1 SHA-1: 06199fa80ada33a8ca851de8748236cc2ac7597c SHA-256: 55963da454eb897e269495edb2bcc4486cccee1fa157e904e7dd74d26ee88f8a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs are indicative of a spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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=tesla+coil+construction+guide+pdf PDF link annotation
    • http://hgbs.de/userfiles/file/46198188782.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908797d532---bagatidudutubinedagike.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oagr3qfrkabpt3dvdnpsascl64/40425533519.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/29988166193.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b65883601---teputulemajawap.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mijelodabagosedir.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3e998857bb6cefddbdd1c36cf791da5c/ridaguwaxipi.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutipovoxasadigakitemun.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/98562702652.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/tekodupetazuv.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/daxelodikupafigozorux.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbfe1cf0ed---91753883189.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7c2f6f1---47832001242.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/10483722448.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d783bc7c6---42223713529.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nopajoxusatekejuxam.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/lixifaxemokunukumoz.pdfIn PDF document text
    • https://superpart.com/files/31220209933.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/vuxovemitidizo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3552012c6e25aee23b038c8c88bae71a/zuwanaz.pdfIn PDF document text
    • http://ciskmv.com/css/file/72832492124.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b464fc3b---runonepinez.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/42320261040.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 18308 bytes
SHA-256: c2d7c0e45fffe660a9e483bf0142fe625a5f5155bf2ac68fd33ccee9057955fa
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 10860 bytes
SHA-256: c98ef9fdf9deddc8c34a9ded1176f2c43e4eed05b22e9efbfae877f986a7b8bb

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