Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3ecc3ec1b0636d…

MALICIOUS

PDF

79.9 KB Created: 2021-10-05 13:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1d3678c09538f4df5ab4a90a44cf9d8 SHA-1: f8bbc069ea9328d731d26a53e5da5549e766e896 SHA-256: 6d3ecc3ec1b0636d916cf13951265d346ed58c5da518a432704ec71cefda7449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a48a9333c4---simakimujatapapipux.pdf In PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/49490581676.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5694005579.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/56314590308.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/7822532978.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/51712416637.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149da18bd1de---mezuxu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906153248.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584c8f73afa---59789557972.pdfIn PDF document text
    • https://dom-titan.rs/files/rugukomogatuve.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/nebigabuzamitug.pdfIn PDF document text
    • http://edeins.com/userfiles/file/132058434.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/29627356304.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nabibolatisafawuxetifa.pdfIn PDF document text
    • http://cityyeast.com/userfiles/file/tovejij.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/84168333910.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092315080397747.pdfIn PDF document text
    • http://tavio.su/files/file/81594860471.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109121111215016.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fenosawizidejazobuvex.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tilexamu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648a6e8637---rojujogijavara.pdfIn PDF document text
    • https://roxracing.eu/userfiles/file/71086685618.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/51101658359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+look+overPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 17008 bytes
SHA-256: 0ea05bdf8da61c9e749c653c76a2307b34a4349dd15cf14a704cbc651f4a650b
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 9616 bytes
SHA-256: 4d56e0003fdeeb4914932af8a714c4b8828a34b379fba15e1c9429fbccd12a61

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