Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d147ce99283fdd6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-13 05:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93f373cc77cce79d53ff15b3c435a58f SHA-1: 33f763b17e62074e160d17ac98fc344519075622 SHA-256: 5d147ce99283fdd6881e8e228bca55b28deca2fa50a58c06d2736c44ee33c886
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lumieye.com/userData/ebizro_board/file/xufazamekotamej.pdf In PDF document text
    • https://saikekanglun.com/filespath/files/20210912195154.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce183ef29---lojajosugokipeguvominita.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2388156fe---tugufekumi.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/20236972512.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/rotuwanozemu.pdfIn PDF document text
    • https://servicepapik.ro/files/videro.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/nanokikidagatinofuwiv.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/71075882437.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/12675111615.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/roragarubetu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/xajeresenog.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tobirefiturozawem.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/48593344782.pdfIn PDF document text
    • https://invest.pl/userfiles/file/91583921645.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/bibagiduvotev.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f826d23f---dagorunanex.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/givosem.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/44679744655.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/44350853603.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/60249339648.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109021424163303.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/66207130773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+note+10+pro+double+tap+to+lockPDF 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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 11060 bytes
SHA-256: cd89db5a40d4c93336a2b98bb6f11f4733b85c2994d15ad6b827f7276decc083
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 17728 bytes
SHA-256: 1c95986508832a8ca3831d23fbff57466cfd9781b7712233c4d11b8fafe3df9c