Malicious PDF — malware analysis report

Static analysis result for SHA-256 8835082d96f55aba…

MALICIOUS

PDF

72.9 KB Created: 2021-09-11 20:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27525493aa547c72955f8e7fadf1a066 SHA-1: 0c8dd34db43d99666f1e016a59c6841c48c3b822 SHA-256: 8835082d96f55abac757841ffbf6d5f2fe127a83fa8cea15b8bf9d4278c4f90e
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 a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301af25fcd4---pulowawasibanelijup.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/bebobajakumekezepe.pdfIn PDF document text
    • http://ipllaser.in/uploads/94022338254.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/44377385812.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090604573773499.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/sapawizafur.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/7456371926.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c9a37b2e---pepagupazimesavozideki.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/77196441411.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/8838507786136404b52e7e.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/riferuxesisesire.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/finugob.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/96311210142.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/deridivuwawe.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/gikovilifujiwukekadera.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/padiwes.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7ae525bc---pipezofonogutaxa.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/nomatizeruzupup.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/puxuxodugegatesixevop.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/42e882efdca4a081e4d0ad04036af758/9974907355.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tu1ntt0hvrf9a4o3fkujcgi4nj/fesixojotot.pdfIn PDF document text
    • http://hocomesun.com/upload/zoveparajamelofijopi.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/penixozesixogok.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/25226259575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=people%27s+history+of+the+us+by+howard+zinnPDF 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_off0000b82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82D 11132 bytes
SHA-256: b0d45f902956a6311dec6262ac9d31a3402bf293ceb308cae5f6342a91598d3c
font_01_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 16800 bytes
SHA-256: ca5d03175a8bc62e00a87171eede2431caae91fbdc1921921cc1fdc97fbf9bfe
font_02_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1