Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2b9305c5ce7c18…

MALICIOUS

PDF

78.3 KB Created: 2021-10-08 06:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c75e0c45601b7c6b237f37d54d25dfa0 SHA-1: fddff6f94dd467e54707ee7108878d7c947af468 SHA-256: 4b2b9305c5ce7c186a3c1ae39ae9ee7a9ab6fd8aa07b97fc32c10f44e431b9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kurier48.pl/files/userfiles/file/77550515538.pdf In PDF document text
    • https://resicolor.com/upload/files/30301525463.pdfIn PDF document text
    • http://trevorhannant.com/10888263446.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/76987322407.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463e3815ec7---baget.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/54672854195.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d5031355bb6589c3b1fdb11413acbfeb/tajito.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zabujufopobapisebe.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/77198817325.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/noretiwedopijalub.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/89070541865.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zafukosotujirefogiliva.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/47240579039.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pidalisumajegogawakusof.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/12443998552.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/441210_vagiseniken.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/wugiwareginesuselowapovo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c5032c8e07---mowepafinoxejojiwebiferok.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/sikumutazewujimilodo.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/xibapi.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nutizumetatofixomik.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/sabudiwitugujod.pdfIn PDF document text
    • https://eklyps.net/images/file/87663913497.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/25038555833.pdfIn PDF document text
    • https://acheapantheia.foliopic.com/sogaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=night+and+day+song+ray+charlesPDF 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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10740 bytes
SHA-256: 26d3831efc2a18bdf14eb67be1afbc8440df8c9d8e027de2051782c52b4a6ec8
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 17872 bytes
SHA-256: a7e17c31b161a0af16d611bdc044980ad5fe84c9686446fb9fc29f6fb0c8ccc7
font_02_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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