Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bfb41cc6ac7eed…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 15:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4757d8514affcf8536316d2260b750d4 SHA-1: 013a7608ca403c7bebc916a810001ce419aaf6e1 SHA-256: b7bfb41cc6ac7eed6738141c41ac5d4a64f6fe6a922534293853ad0fb64aeaca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of external URI heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=soap2day+the+hitman%27s+bodyguard PDF link annotation
    • http://guoyangmoju.com/userfiles/files/54829013418.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140822139720---vupanunibimeduvijar.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328264052d3---13813048062.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kukodofo.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/97292757460.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/88032106420.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141933c49042---supukiwugolofapuxanini.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/11252495350.pdfIn PDF document text
    • http://intersonik.eu/upload/files/6969886013.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/mifefafog.pdfIn PDF document text
    • https://masukpt2.com/contents/files/30007746188.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/dezozojinagov.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/puwodigirozejasotunafabep.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f091d334c1---6245359304.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/kaworagumexigosa.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/pizifal.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/womeborabupusa.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3a76cbfd---53756232596.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/14445895249.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/62086006836.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/54262601315.pdfIn PDF document text
    • http://sin-hua.org/userfiles/29241819457.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/tiverakigujuxofok.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/gifutujuzemududumas.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/77537811904.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_off0000bafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 11376 bytes
SHA-256: 26a9e2eb2a760153478f8a8905c70490761437a47ef924b9cfe506f8dd6518ff
font_02_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 16416 bytes
SHA-256: 67cb0ea3f1e3ced0d1a7ff91366bf8c192c27b654e1f3885d084408223a9e7c2

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