Malicious PDF — malware analysis report

Static analysis result for SHA-256 128a965bd5707748…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 23:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f5311de07d9a17b48ab92b8934552b8 SHA-1: c6188cf340ed7a85c33b415ddd18beca58b5e1e2 SHA-256: 128a965bd5707748cb12b8ed05f91a0c20bc4b313b51d6472aabd5fae62ef0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to artificially boost search engine rankings or act as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=pippi+langstrumpf+text+pdf PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90e9a0e76---12208894839.pdfIn PDF document text
    • https://fultoys.com/userfiles/pomumimulirotafuje.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-29/20210829051207168097.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/55853738905.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/62935030432.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/jojonitofi.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/97997362983.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/basetojamiporatufu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ccd5d933---gepexasodim.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201058406212.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xukejutolulukalepe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3e256cd0---bovakitebuju.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/cc9e4ec7c337e0553eb6d3ac7e5e0109/sesupemewuve.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/31878347188.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f408e610a3---bexogit.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ff2a31c4dddd1abfe12b89abac55bfb6/potuguvo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/67959954300.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/abdd1e4e5ef3e2926a3f2654d97ce5c1/muzeburavizadobow.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8b21b8f23---25809405365.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/bemenifurolorepu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/13b6150c3681e80bde24d53359e5b86b/xexoveguvawaxabiduvokak.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jarenudukipizu.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/pifikowitoxomoxobokaruje.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 10924 bytes
SHA-256: 69652185efe834ad9ff45b00c650ef6a0b7126fbb4213d931e57f4cf6790c72d
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 21624 bytes
SHA-256: 0e0f2beacec87e44cd03915c3070ef55ab91d1793b25d426f02775d30730265b

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