Malicious PDF — malware analysis report

Static analysis result for SHA-256 670a92e5d6c0884b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 10:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ec3c43de5445d46f1efa456c177f7aab SHA-1: 3cf6b80604e5ae8078c4fa40d9356e4c5d5c3342 SHA-256: 670a92e5d6c0884b362905f5b2d35e5b2f45a8865316daf763beab6d17ad9c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://medvor.ru/uplcv?utm_term=hentai+game+android+rpg PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fba5a95780bbbf3e4c7bc96526d7baac/82583687490.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/3015460438.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/wejunalavamevu.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/joxanefa.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/pogakevuneraboxaxu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a9a0366330989325cd4459e758c708bd/manovomi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/70954796588.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/rupit.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/tumiwudot.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/37174548871.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/64909298793.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/sudowunekobodivuzezakufe.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sorus.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38807459014.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109191744155388.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/161c2f6667338e713c690bed20abe32b/jurikoda.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/wugame.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/tokejidudejumuxilo.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/tinoleterajuviruka.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/vonarutabikegariv.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/43730060405.pdfIn PDF document text
    • 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_off0000af19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 16468 bytes
SHA-256: da9b001b4ffb9b0082b6df3c03347c3a9b92c9dbc0bd24b929dd97852ba9597d
font_02_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 10512 bytes
SHA-256: 77170127b957297a1a1ab599fc9bddeeaab57ebf60eb9198690c7e9a785dd692