Malicious PDF — malware analysis report

Static analysis result for SHA-256 676fa6feb2d8bbfc…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 19:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bce66a4bf68f4a4d2680da7a79673020 SHA-1: 6f2509a9736fa1a2c673b2570631182ae5d6a5e5 SHA-256: 676fa6feb2d8bbfccdf617299cb5a5fce620cb2101d6c81d876b6fa0fc94bc9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=how+to+get+free+robux+2021+mobile PDF link annotation
    • http://aloisiquadri.it/userfiles/files/pevizuk.pdfIn PDF document text
    • https://istanajp.com/contents/files/fitubemibudevefibi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kuvokarixelivirejutafa.pdfIn PDF document text
    • http://sunridgecorp.com/uploads/files/202109070007054743.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/sifenev.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1431e633---xaxebovaveno.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/silajadidabavinajuxitisa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614c454e260e0---zobobijexozunarabupofibi.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/werax.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/14576853045.pdfIn PDF document text
    • http://belloverde.net/emailer/file/99685836161.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vamikabasubugurotesop.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/39687826132.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44eae158b---96848432975.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/69272022879.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/xakajovizet.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/jigadozifub.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/48873949354.pdfIn PDF document text
    • http://tercovci.cz/files/file/wapirasixevufojaf.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150888e87efb---vimulogifonaluwafafipej.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/kaxozipelazogu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149b232c569d---30373619089.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/67943609719.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/84171066954.pdfIn PDF document text
    • http://cortabellanews.com/userimages/72513388094.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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 10836 bytes
SHA-256: 5f62bad07745603ab5b756fc7bfec65276ca1e64594a1c9a5b8aa0efa14e70d8
font_01_sfnt_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 14576 bytes
SHA-256: 84281a18b97ec369d60e1ec4518a0d5d1214ca40f5675c1db52a611c0d678c97

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