Malicious PDF — malware analysis report

Static analysis result for SHA-256 a646281e7f1b8a61…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 05:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6141fca9f4c64d2ec9544f120e5e3ca9 SHA-1: 9d8cf6e6e4f7cc8202016c12f35a82ac8f97318e SHA-256: a646281e7f1b8a61aef953cdcdc6f6d972d4855ab44aa3fe19188eee8314177c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with multiple links pointing to compromised WordPress uploads and disposable hosting, designed to trick users into downloading further malicious content. The presence of numerous external URIs and the PDF_RANDOM_URL_LINK heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gsacademy.ge/uploads/files/wopitowibi.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/93611619666.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/70335775636.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/84230636365.pdfIn PDF document text
    • http://unibox.lv/files/text/41743165055.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210814_09CA67FC3A8CD7D7.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/togumanajave.pdfIn PDF document text
    • http://nature-revive.org/files/file/fodukonalosurekabuk.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/lavuxiposofajugi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zasanikekevejib.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff6fcdbbf2---milixaxeviboti.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ma7338466jcsavk490fgfq04u1/38139851931.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jj25rpbb4m0crcaofmrhn6hs71/27527786218.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/tozefajaw.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ad16359---jafikobimoxiruwovaweb.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf6fe1eb7---55786254771.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8vpr9nfsh832hnofvloep09lja/24280158645.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/226868caa24e82e96d551df5eaf93ac9/83360207215.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160942d4180c1c---norozidoxufokojugeto.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2cm1jf8cnp1coteikj9p0vn1v3/70110634385.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc10373b9---donur.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f3d1c4abc7038a961aff484cff007019/67482672798.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/4811119392.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/25939228044.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7a5cca9520f7f0971fa04dd6f9ec470e/97783172212.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e65813bc---86643312401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=thickness+gauge+mitutoyo+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_off0000bd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9D 11192 bytes
SHA-256: 5a0178070d1a6b080cec1ccdc8cfa142aad96ec2351a65e5cc8ccccc49a68ca6
font_01_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 17800 bytes
SHA-256: 87526435f37be2740341f27eacd0e943b20e8d1159bd4636ee3b2803a736066c
font_02_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.