Malicious PDF — malware analysis report

Static analysis result for SHA-256 7903ed8bc0161ba8…

MALICIOUS

PDF

89.5 KB Created: 2021-09-03 23:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e152f23d87f9fe0839b00cf804ffba2 SHA-1: f408cb4eaba5ea6b358448c7462361ed0648f922 SHA-256: 7903ed8bc0161ba8855fe95fef88823d116034580e48017912c7a4357af752d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://btc-ltd.com/upload/file/10749178222.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1c1391fb3e5fa96f0842d6ac9c7325b7/vemawanip.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/bonatorevevosebikubomu.pdfIn PDF document text
    • https://ptogel2.com/contents/files/82528376005.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/37006583932.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/29241700025.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbccad4785---51436468600.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/kexutoxiwerunufiwa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6a681c5d9f47ff0b73dce015b3f56cea/79076002015.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/jupazuwowurufitirapexa.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/koninojidoposizaworetus.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d0de6d975---juronakosuzukifetupa.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/84116941543.pdfIn PDF document text
    • http://huiking.cn/uploads/file/1512271116.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/tosupopubivigirufup.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b1e574c2a---18778623728.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/43963241454.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/87417244611.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/losamurizu.pdfIn PDF document text
    • https://samowar.ch/upload/file/dazinixolaguvevaguto.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/71236593448.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/21828932706.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/37d63c8f993b812c209fe09f56200413/1071178389.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7410d18d1---73263021279.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/fomuzupivapimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vmware+vrealize+automation+install+configure+manage+pdfPDF link annotation
    • 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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 19036 bytes
SHA-256: 9b35773b7c76fecf28e390dccdbea993770063db999ae4841c3a21d98d29a226
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 11244 bytes
SHA-256: 8bcc346f2e55df3902a204ba3c0a212bae84f3a30a97d91881aab3579e3285eb

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