Malicious PDF — malware analysis report

Static analysis result for SHA-256 548f485b6cb0ab4b…

MALICIOUS

PDF

98.6 KB Created: 2021-09-04 05:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5ba1145e11ae3f221f3669f8b3f32bc SHA-1: 2895926c3233b8318bf7b1e3f63132ffc73952c7 SHA-256: 548f485b6cb0ab4b54356d2835366a6c5e958ba8b0d12731975270a04494ea69
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the detected heuristics indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://jenistudio.com/upload/FCK/file/12690891448.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/uv907ui4pg9h7q223n650q08fb/46482614683.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2a09ceb1---lokepiledawagug.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/zeluv.pdfIn PDF document text
    • http://planbmedia.hufiles/zilulixowegedeb.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/bujelukuxurokajewabepun.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d19b8c7---wujamisufuluxopi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/adfa0b91f1136650e8e3431d0b71bbb0/59161752628.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726958d3928---zekepevukobejegib.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/letazibewuras.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/16794911267.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd67af3ae4---belirimaruxapivulojag.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/31892409117.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/59873075365.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6705e5821ca2be830b15870f8c41ed70/tamet.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/xetarewu.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/zutisutateb.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/97036449518.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/63569533008.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4e671d9b66e982ba5608f28655abfce2/14528699510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=migration+and+economic+development+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_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 10856 bytes
SHA-256: ca339589b3873f6b3d5bcbd3fbf3aefaf2ba5d521d9bf05bc856f6475f109b1d
font_01_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 19548 bytes
SHA-256: d4056c5988d2713d24d9695a2cee20aa092180ebd7e5fb80f22faf68a927757c
font_02_sfnt_off000164d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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