Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4ff4e25e7d4cef…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 11:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba7150f3c0bde84d8512ea537eb4866e SHA-1: 64dcd07ffc75398b2aed5e76e3cbdef8babf1ff8 SHA-256: 0e4ff4e25e7d4cef54910337a0781a63bebeee97477f8a1e1a0044426b785bab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate that the PDF is a link farm, with many links pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms strongly suggests the intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://creteservices.com/FCKeditor/userimages/file/15738149387.pdf In PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/xufavawunok.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/76654941549.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/82803030499.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/korafevoluxasulu.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sajowinapexikuderamu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138768bc9486.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/38432267527.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-5/20210905184558805574.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/18505558095.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/dusilelatobadusipovuxeg.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kuwisuzaxakutanu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8s2il7u5gger3ntd8t51c0bq25/59955365376.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/subekisufofev.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/laxaduvep.pdfIn PDF document text
    • https://pepsima.biz/files/file/fidefetarexe.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/gosokab.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464b04dad8a---watevejapusegida.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/zataraxuvipigaxifobirufed.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/31843225495.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/8322806029.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/84863324798.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/budonomogorudanom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+18+vs+android+21PDF 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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 17296 bytes
SHA-256: 861382a2e14ab94bbf0c4e580ff4cff3f7d3a3450a0b7e0575e1ba94593f0806
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 10392 bytes
SHA-256: f2779b83c2f53f0247ee7afbbc5e28e4eb37e8865257a37f8b4d099a1a0a493d

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