Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153481e192b3bc3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-30 10:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fc6761f3be3116f31268a7a28d67a28 SHA-1: 897c5f6b9182029f6265259ee6994c59d2bd3733 SHA-256: a153481e192b3bc3cbb800406aa030e5f1fc9415ee0d9ab6e227d942f874e4b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to obscure the ultimate destination, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=henry+tam+and+the+mgi+team+pdf PDF link annotation
    • http://jngf.cn/files/file/fopunubamifewixolukavip.pdfIn PDF document text
    • https://beautydent.hu/editor_up/12668347075.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/13331830125.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc9071fb62---60830979484.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/13955642502.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/73864275749.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909221535656753.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/7934467850.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufemixipebewel.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6130a9d641efaba0386149f0d8daf029/kewaki.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pqkmimid7e07j6o1e0ercud9a1/49394742616.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/91107917830.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/1236117792.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/xegiwali.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/xonerogulabetavawujagufos.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109130825323710.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/relezozigowepodedisa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92f2642263451f8bbb4f9e1621ff2254/kibilidir.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/42050237523.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/10648467011.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210922172406.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/gejaluxesisosuberaro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 10716 bytes
SHA-256: 8d30cf7db80809f67193682298329803eb094a47309a439f079a67bdefd1de55
font_01_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 19116 bytes
SHA-256: c34276e659d4ae2f16e3af943fbbbe4a18110989583bbefec46c81315ec39386
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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