Malicious PDF — malware analysis report

Static analysis result for SHA-256 305c7efc89fe1919…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 05:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ad5db4ab7a2b66594e97df88752ec6d4 SHA-1: 7fe8eba607eb5d086893288ac76ab4b8f5fdcd39 SHA-256: 305c7efc89fe1919bf34cc398680b0e5aca05f097385faa28c30cbe48e12c46d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614120e3615af---54928779745.pdf In PDF document text
    • https://rovetco.com/userfiles/file/85120912390.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/nlooar0qu37koof087n4tuia3c/lodudipidiwodazopaweto.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/xetudi.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/62797728832.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/610966d59ba2433058f495e557cbf7ee/jubonuti.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2b8c5bf---vukoteregigatipukuko.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/fegelamesawimagupirodi.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/12529146684.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/jizivanite.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/73544330071.pdfIn PDF document text
    • http://atrsara.ir/resource/files/xalegobipu.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/41704334979.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060717318418.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///wuxibekibemudu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/84700954150.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/toworusilefasem.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/23737686090.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/773138985.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/zalal.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gipawudivipuzeji.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/dikiwofuremavadipireruzav.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/80285746301.pdfIn PDF document text
    • http://soles2walk.cz/data/file/sexararebumomilowuta.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/6074141586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=note+plus+screen+sizePDF 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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 18588 bytes
SHA-256: 95d69e89f0a3abe79d5803a9de6f8860b10ac830f0a2d1a15c3e0b9cf63c749e
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 10340 bytes
SHA-256: c24612449153f77bf2a758df693b5af71d51d7a83c49961de516bf3f7f7280b2
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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