Malicious PDF — malware analysis report

Static analysis result for SHA-256 de763a76a3fce654…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 03:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d7b7c2b9ccbb44765c745d3f888287 SHA-1: fd0f561f80fcdcea139f61d4f7dba76a410f101f SHA-256: de763a76a3fce654c858124685737ddf9a152ad1dfcb141167fc504ada54f2c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://launensia.cz/ckfinder/userfiles/files/56582971083.pdf In PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/pesizagonumozigawigaxenok.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0621fd7606---51975425029.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibugu765s2u8764087903u36ld/pafajipukuxenoli.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/pewuxupimemoke.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a217dfdf8bb---46312124547.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7c1b25a9---74737711822.pdfIn PDF document text
    • http://mq-water.net/upload/ragemo.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pagex.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79662e7680159bf8f10c1ea2348c8a11/74654872922.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/moxir.pdfIn PDF document text
    • http://knipia.com/userfiles/file/rofuzamidozugumovusu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/426354b98c44185f91b82a268f69c167/nazoboguxadilalit.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0c6545ac6ae6b31fa607de1892ea3674/7393957892.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/20491050877.pdfIn PDF document text
    • https://anaksemut.com/contents/files/sulelodumanivasepam.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609829fc01363---55768299263.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d6b754c38b286d605afb8bc86e5f5a64/28097157147.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/64060996853.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dce1cb3d33---kikimebetufar.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/pivubojizotikutufepe.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fm5f0jbj40knvidgratj8uni8v/1081252682.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8b7e8f2bbd---65232281148.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90bab68c6---zulep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=governance+in+india+m+laxmikanth+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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 18124 bytes
SHA-256: 7ffd2c65ae7237d1128159b67ca378d8c3f736e4fc5a70fe80fac7deca0db6c2
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 11016 bytes
SHA-256: 6aa4158b92d0deb81f1d99e083344200ad3fc1406eb0d89a93de35a542081390

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