Malicious PDF — malware analysis report

Static analysis result for SHA-256 a844936574a25736…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 16:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e619f2ee8ec6e5fb61cd7fe4dae26133 SHA-1: b7625a3498e8f304218b7b1101a82eff184433c1 SHA-256: a844936574a257361e2b1f489dae843f048ddf9faeb2b9b281db2aea0911bd65
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://divorcefinance.nl/uploads//file/lerasob.pdf In PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gotasodiwuxemasosemedu.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/tosejufaxejar.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/mosadodolilenumur.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/sitebiro.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108210319352081.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/kujetuzotitu.pdfIn PDF document text
    • https://camelcarpet.org/d/files/85841247504.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xubivexorodoxawos.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/rafuwunekawodagagozorakod.pdfIn PDF document text
    • http://zae.me/datafiles/file/1337252812.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bopoziduxasuxe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/b5jrrmqde7mg56c4dv32nlmh8g/91249744106.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/bixanuvepigasopiberowe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ddms0m8g85n9435oogd28kpqqk/96391700710.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2a3f817b86042644120c060fbc6c8a72/tuketuwalavititezifojux.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///22509898680.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/nb6c867gd0pf9q3qbvlua3ikm1/kufuvonotur.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/88604433462.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/pasebebara.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb6d1c285c---9277137632.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/13187945435.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/tetaposakixegelu.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/22129512566.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/wopilifitosidusiwenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gitarre+lernen+buch+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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 10708 bytes
SHA-256: e9634b9d60e11bd10e6528f942bf477335b579189c7cbeab13c10b9200a358eb
font_01_sfnt_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 17312 bytes
SHA-256: 2ca6d38ce88864e673034872b0861bd261bdfb6eaf4804da786a2fac35741b2b
font_02_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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