Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c5f01064484c78…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 01:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47d6bf8eaad586b233a22faa5d43087e SHA-1: 41cfc4c5278ac175930a98c1da5dac87a900cc34 SHA-256: 27c5f01064484c788f993f57dd93d5d56655724fb3ea7f98ab64eb66bca068a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous PDF links and the compromised CMS upload link further support this attack pattern.

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://civilkontroll.hu/uploads/file/xexojo.pdf In PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/funorutajejaj.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/posigesokiruvisedezonapol.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zurexolipakak.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/roforovagipuxulim.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/22662065324.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/90606972985.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/40067239955.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608057f59749c---nemazupez.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/vurezoxow.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba111cd13---64187517781.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/33508121078.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ot8vvm97dn55v5tam5iqc6boh1/27990637735.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/silasilizunosewaf.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c4964111290dc64b8faecd50e78ac616/6055974662.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/ladabamedifodusa.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/sidida.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/mopilupuzaboxobomeviv.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/sovup.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b72a89e15b479083637e4af7eab8bf85/sugavejexog.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/20784931148.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9f9cd3dc---gifejivaxepezijirukus.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/623e1f7a21dce2d06d03d33fa40370fb/matilarofipanuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=electrical+measurements+by+bakshiPDF 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_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 10804 bytes
SHA-256: c2091bea88ad5298d59b32668c604e84e1e3048ae566c6c13f0c294aaf2a3ad0
font_02_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16644 bytes
SHA-256: 4dc231924b55056f86be822611eacefca94de61f168ed13c76227ba56d05aa53

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