Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb8f05ea3684522…

MALICIOUS

PDF

99.4 KB Created: 2021-09-01 03:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ec1034727f42e97c56573d2e5381a7b SHA-1: a4a1fdeaf76360e1760c396657864bcd8cdb9750 SHA-256: ffb8f05ea368452286386ec20eb84e582291433c677802f21cfa3fa1c0eeb2fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically noted as a potential lure for phishing or malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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=corey+house+synthesis PDF link annotation
    • http://wronba.com/uploads/wysiwyg/file/75846005495.pdfIn PDF document text
    • https://kiptep.ru/file/pekorubewonibibojuzuxeb.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210802_34C585C1230D2469.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/gifisomefoxafigo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/birez.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/juzudetabo.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zekadawa.pdfIn PDF document text
    • https://morabia.fi/images/file/98752845194.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e29cc074---nubamalixugonulavetun.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/44661601772.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/45441894847.pdfIn PDF document text
    • https://orangerun.re/photo/files/43833147798.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/94686069434.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607628eae4a1c---51085802220.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/gakasaxowava.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607464f5abfcf---dotudogixituwovir.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/25394822943.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/89884851528.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/jokenepuripediw.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e7a744e1790452720648cfcf94439335/90925893335.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/42236217242.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/kekemagixevopokovurozene.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/11442840261.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_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 18448 bytes
SHA-256: b54ff8fd6a7cef56656e98c7affb990a8a4c527b7dd6666a3ca811c0d57e711b
font_02_sfnt_off00016823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16823 10240 bytes
SHA-256: b8f4d8fe7cc2590216a035bc938cf67f30ff113dbcfa563cbb8871e4fdfbe8d8

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