Malicious PDF — malware analysis report

Static analysis result for SHA-256 0553ec390475e642…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4147d6bd91eefadfc9dc47408ea0efb5 SHA-1: b4a7d4c263231e5726c91a397f23604f1e15f311 SHA-256: 0553ec390475e642a2a1fe80db813112782032aa205959dc636584a565d714f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8282

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=judi+slot+77 PDF link annotation
    • http://nusratali.com/userfiles/files/bifelilupebegikozes.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/voraxizexun.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dfa6a8321206e1cd017dbf7f9d2600d2/navej.pdfIn PDF document text
    • https://cakkue.com/contents/files/nuweme.pdfIn PDF document text
    • http://clerus.hu/files/file/nedeza.pdfIn PDF document text
    • http://torgoborud.org/images/file/158224147.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/78614405867.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/17862613124.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/zojudaxapuzi.pdfIn PDF document text
    • http://lejuriste.ru/files/file/menukawakefekapi.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/1003084194.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/ximopowo.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/99061341214.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/89037995749.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/46131681353.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334927d9e02---sedovaduxasulimofufiwe.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97188549356.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tezixonakarozazidiga.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/zimipesovulejofuripaf.pdfIn PDF document text
    • http://gugugroup.com/userfiles/kimakano.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613724c9d87de---95349624294.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kifegigi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17428 bytes
SHA-256: b2fe8e14705259f1d4c1abec50500383e8463948cb4ce255ea1c1c8e4905fbac

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