Malicious PDF — malware analysis report

Static analysis result for SHA-256 533db0e63934a829…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 10:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 345fb70932301fececb6bab4e31f9ff1 SHA-1: 4a23f385074080a15ddf32865c5fde31da32cd9b SHA-256: 533db0e63934a829cf497c0bb2ee2cedd6cd51f893619b160d4d389e18a4d113
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=ballistics+calculator+app+for+android PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8365aa5db---89252842997.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/27173103965.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/burugufikavufovesos.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/66933102911.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f55c628b0---88125973412.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-13/20210913235720680453.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/23627111903.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/23050982577.pdfIn PDF document text
    • https://ebooksweb.net/files/file/43543890099.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/97257965851.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/6915870178.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sobubopitowekegu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/47690557533.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/57521811492.pdfIn PDF document text
    • http://cortabellanews.com/userimages/kedezogeba.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210914113424.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/98665776613.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/satazew.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/90589861889.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/44585041838.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/tibotibedavun.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/dodoz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd391f49---tumenezipugiz.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/16484734783.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/dupirenuxotupisezosowix.pdfIn PDF document text
    • http://santehnika34.ru/images/file/powapizanakopan.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/64673160505.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/73781634743.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_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 17332 bytes
SHA-256: 42fdbd8c8de865bd7da3872381522ca5d8be1595f26eac18fa63fe8fe930355d
font_01_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 10636 bytes
SHA-256: 064076b5068f4a24e9112afa6b3f57ebd7fd88c1309c2920df2365f67651837e

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