Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3c021b78331795…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 09:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cd740ada3f6dbc6217003c4cac40a385 SHA-1: e592e4c2be705af36ed4353eba46bc365359d84a SHA-256: dc3c021b78331795d18cc2f8c0e01cb6c6f095642dcf8a402319ab59109ab558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns suggest the PDF is designed to trick users into downloading further malicious content, likely a phishing page or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://silesiacapital.eu/data/file/ridovitediva.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615249d9ae46a---bezeduvodurogo.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/bitepuxowosizoxatoda.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/32774485863.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/sezadapekawokirax.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71327350090.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/26449103393.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/rejimolezibonibesim.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614541d611771---piratel.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/soxamaxarafekomoga.pdfIn PDF document text
    • http://fluorescent-training.com/file/88664083119.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jewufexavul.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/nirivabuditalifaliwixek.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/lizadifivosur.pdfIn PDF document text
    • https://labelmarket.eu/data/file/wajizuj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/64433538138.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc280de38e---fulafalalimopitazidole.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/xanakuduxegodivumus.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/navozejasefomemal.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/96501898323.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/39774168528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tubidy+apk+download+videoPDF 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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 10580 bytes
SHA-256: 5355b4eb5cd136e0d3fe4145dcf3ba7f76f69d8f07228e13cf355f683abf27e7
font_02_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 16984 bytes
SHA-256: 62c564c3562f69a2dd0636ead49eff37174574de28c1cd8e218c5cd701a1bf63