Malicious PDF — malware analysis report

Static analysis result for SHA-256 169c636669fec131…

MALICIOUS

PDF

70.1 KB Created: 2021-09-07 19:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48b074d38d36e4ea61c3921030a7d18f SHA-1: ee1b4f6a6eb180ea554f08dcc25a24b0edcc9add SHA-256: 169c636669fec13144e318f8dac29c515169187bbbe2194f74ca0741e81696cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. The file's structure and the nature of the URLs indicate a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kme.pl/global/app/webroot/uploads/file/16251404138815.pdf In PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/40291881179.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/67696045375.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kusivodexedobaxivifujo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d558994c6587b23c0917987649d8c84b/80892838808.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b01a21d2---lobani.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/74946954128.pdfIn PDF document text
    • http://abwessex.com/uploads/files/lalodazibofusojik.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc161ae9f0---5634090032.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/21106828791.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7ecd3eb1c---70396328770.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/naxulidotubijemo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nobezawixu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/chfpmpi6vv3499nj7jgh2fsgf9/mimopajesapagipeni.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c5fa5edc1bb59691d3112f08e832e0e8/36642187671.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/93242828803.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/97663390068.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/olth6qv2blt431vu57gpc5fqh5/59234987421.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/70703827338.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97913779547.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/66463594403.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/u868a0se33ddgioi0do4mt9cns/76283245384.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/27144348160.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/43041390903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=investment+management+and+financial+innovations+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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 14988 bytes
SHA-256: 4bc31d1bb442999eaed642d2c0a5f5b0c0c012110a016ca68d7720aa9efa99fe
font_01_sfnt_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 10880 bytes
SHA-256: 13c0bca62dacf783dc7359b96ede2083b4819085cbea01a2589021756b1c1cf2
font_02_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1