Malicious PDF — malware analysis report

Static analysis result for SHA-256 6298a099986404a4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 02:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f8ee5250ac1c2711ab0d9fa53af2688 SHA-1: 1110b3275c4c21d51b90588c86d98025b9f89ec0 SHA-256: 6298a099986404a42dbedab61dca0d0c7ff98a367ae6488fa480831f7b37b03b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to various websites. Many of these links point to compromised WordPress upload directories on distinct, disposable hosts, suggesting a tactic to obscure the true destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://labotinnghia.com/img/files/bejozidiwitugaz.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2e8be739---wuvukoparem.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1d122393---59697741377.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf9e50382---kufexef.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d039e90d2329c8e6bf8c9eddd9179272/dedokegole.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085a71d4eb84---47114966861.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cff7cbe92---sejutebu.pdfIn PDF document text
    • http://kotolantopeni.cz/file/rexelaxuwap.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7db492c6---gofenakoduxamizajagi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c626232bb00---tenipafatapifinivowuw.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097b98d60b---panipinijel.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/42326914650.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/pibagorikemijebefizeteg.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/42160828493.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/prc89gq4o6673gnk3bjinlh3nf/numofidofizigomup.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/fulitavorunusoxonagapi.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sifodakekuzo.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/ruxowijafe.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/16109887886.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7698138b12---majofunibuzaniwuretafilu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jixakafejafodufevisem.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/41590548827.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pigulaginomoxagenonin.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/6229082769.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/399e265b9e9d11b2afc0b34f34a602e2/44230814323.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/47502465836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reface+dx+manualPDF 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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 17220 bytes
SHA-256: be857409ca8f49ac3c23c0235c673f99396442734288c315204ef7664d52bdf3
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 10304 bytes
SHA-256: 35eba69afb4049c8e9bd73e81bdbc8280b00468aa8676ada5ea765392f188cec

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