Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62853406c7cdc2c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 13:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f32f25cb650df2b0042076dd74f53e7a SHA-1: 77463b09048c60e41edc94e868a890eaa53e1e4e SHA-256: b62853406c7cdc2c70b2332c65cfcd6f0faa5b46bc95e99a702b3bba37ed9ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=rugby+league+today PDF link annotation
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8c6dca9484965e130cc72a8b7101fd2f/52603512989.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/64275314451.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9080f23644c069a030310fe9a3d71196.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16101033f221fc---zediloritigijomuwujitaxu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/bazipivulavojamuxuzomot.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735684a421---78582312491.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021081222046_1015920916.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607366a384f1c---paxebusagilijazapedepar.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/dixagoxo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ipv6v0keakj3m80kkf63i4d7oj/50431631201.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/dafeva.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/51377056370.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a9558c5e7---jujinuxopijojalofoveluxam.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/lasozavub.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/rupuravebufuxasiko.pdfIn PDF document text
    • http://sbairs.com/datas/files/52415645382.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/86095091698.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/buwomonubevevofurofalo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bedc9d4a3---fujaze.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65c708bce---pujegumolu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266b337599---tamixokabamalaxof.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 19968 bytes
SHA-256: 74def0e630ac85b65eb2ee26994e28ae11a7e8aaa3bcc06683b150e5931cefbd
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 10356 bytes
SHA-256: 7855ae1e733128f1d301b690cca74c535fa6e05d831f17167b747737228ac77b
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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