Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1dd8428c0e2cd3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 01:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0c10a49d4cbd41d9762561d4fdb4c58 SHA-1: be190046f8bb3d212015b58e79140f9747167e8c SHA-256: 4f1dd8428c0e2cd3978901a3a3131494876b4aa1583c660137e077b64d6e3e61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF's structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://parquet-cortes.fr/data/Files/94491058343.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98078e2834---zawijifetufepibiwi.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/73596843770.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1014c188c---vumapadopowiwurobu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087abe849999---36855573448.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/fegibisipusikurexuxo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/mavewa.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/96869731597.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/lexanujuvuxoratavuj.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f9120b2c---87661512062.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/72019203283.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/48c22a1238841ecfd5645ab431998c01/pozepugunutulivuramenoj.pdfIn PDF document text
    • http://ktcz.eu/files/files/80877890493.pdfIn PDF document text
    • http://ombs.ru/uploads/files/22449098530.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/49139131325.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051002371336663.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2995c2e98786e1ea72a04adcaf87ffed/soxotawosaremujixafunewep.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/22d79be500913f1a17f618be7e82cadb/ximimogexapol.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21350688f---pamejowodunaduvavenipo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4cb7d83e7a442671a0a886d901c2d6f5/16764390170.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf378bb8c---93913648040.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/megisepimajo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e0457aaa---10737304642.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/jubuzepuvotaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=blockchain+programming+tutorial+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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 11012 bytes
SHA-256: 1193a01dcf1979d6ad66a83caadc880e695e8619dd884f2242d7e90b0c831296
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 18248 bytes
SHA-256: 31d95fbda75c51f6096b4b096da1dfaf7d6680414e7449324d24b487df93cd08
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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