Malicious PDF — malware analysis report

Static analysis result for SHA-256 465cc54dd7639f35…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 09:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a44372009fce6b8d804ee2d870ab4585 SHA-1: ca4208e532c396d5c5033a0f37cb8283893cd6a4 SHA-256: 465cc54dd7639f3504e493e6f5975174bd0c2a505411e99cf20c79da90bc6b74
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The primary goal appears to be SEO manipulation or redirecting users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://buyo-g.net/userfiles/file/suvevobadofaluzivub.pdf In PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/92042374782.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614162b47c109---gisogexolezuxewidu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0df846004d458fa80bba86611feaa21d/26889085874.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/bugozabopi.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/6669508945.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/64200195813.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/75045062724.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/pikakisasowalonukiginakun.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/vasowugukidumugobexewu.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/92175240611.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/19840992748.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/79516348322.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2259cc6d---bomogukol.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/wemaned.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/nipeduletokunizewubode.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wabalolidizit.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/balokulezagigeg.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/noxeneliro.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/59435981484.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4bbf419d376dfa7a8ab484fc6f89bf3f/59754300169.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/kokekalexumatuweruvuvuf.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/jesoponevi.pdfIn PDF document text
    • http://anpo.vn/upload/files/69385771420.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/16241334247.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/24232743693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mwf+motivation+free+ebookPDF 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_off0000b9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C1 16900 bytes
SHA-256: edf5cb0fe9f7bf3caf83e272b90c0cfd880fb02900f42ebb37a3dea65dbb9889
font_01_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10540 bytes
SHA-256: 5e38b7fa77f344d634829b46d90ca34ada3c883944ac4bc9d1eff92258f0a889
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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