Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d187b89f5f3007…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 08:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31e31d844b3b4b6bf7636e0b83c114de SHA-1: 084d13c10fd3ffc53cf7bcad7ef317f01901a331 SHA-256: 70d187b89f5f3007bda15d06f3292e17d41ba43f824954c353a143646b0af885
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4d0365e6---73501594126.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bd945cd3---xowitogomovuxunolitigux.pdfIn PDF document text
    • http://semagro-msw.ru/pics/images/file/gikawibujalowifopizitatix.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/72103772646.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/39026730367.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/zunududoxef.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e376b0f2c7dc3aae5300203e94c7f0d9/nexovugowizar.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/terokobifojuwizuxo.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/18969366460.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/birunalipoj.pdfIn PDF document text
    • http://goldmustang.com/files/files/48192373172.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762cc87d3ed---guleruse.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/mabudolinuvosopupidija.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/78606543870.pdfIn PDF document text
    • http://186086.com/upload/files/mujexudonurubididilufanaf.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/siboda.pdfIn PDF document text
    • https://electroagro.es/pub/files/3134772459.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c22edde---562701737.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/31098431946.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/vawuko.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/nowewujogurijafapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=extension+of+ms+excel+worksheetPDF 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_off0000be3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 17860 bytes
SHA-256: ab168376541ab00bba90c44edaccfa43aff6b0a6aee0011e9751b446300cb282
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 10704 bytes
SHA-256: 962f9835cfae33adc08db11e6751df394be30f39d299f9c5fae552ee124a1fe7