Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d14b766ee9c4847…

MALICIOUS

PDF

87.0 KB Created: 2021-08-22 00:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e65e8ae8c39cb8bbd37493a052e3af6f SHA-1: 16f95c65cde15dc1e5af3346327c51b0ee390ef9 SHA-256: 4d14b766ee9c48478fa29bb61674168c9421aaf0c76699be4470bcddf234de0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=analyzing+data+worksheet+biology+answer+key PDF link annotation
    • http://olynskiconstruction.com/pics/file/pujun.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e296673e---benewapene.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/479297739.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ae86ec4599aa88cabc418cb8ccc4966/modebewekomadakujajof.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3980fe9a4bb1df625d63916150b874b4/gamolemoxeborokutopu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/poxinepitox.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/bujiwibido.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/teretuj.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/vinuwewami.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/tuguwebowuderos.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea059d492---rowukegeminuwufegupexap.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607001ccab369---99529295088.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/78207864882.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/34930843558.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/fatamixujazetewujezufu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c29478c149e---62198097716.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/bapusasafa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-17/20210817020358324319.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/40574835389.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/26420087459.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608437569de54---relaborajilaxatiwaravokim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affece620da---kamopofaweguna.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_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16344 bytes
SHA-256: 97bb1198d3c2a70e385a52e3b21ec5e2974ab2b342b82221bfef4b8644c7cb55
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 11000 bytes
SHA-256: ba8aa096efbeb4358ddc8f6097b802ef7cbd29604fe2a2e0777e7545dfc953c0

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