Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee825f04a3b70167…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 14:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e2e57d1c377675c9effd14e6e343864 SHA-1: b438593bf8e77e745fdafbea97e61b869059e537 SHA-256: ee825f04a3b701676351a1d0b1f7ae9c4675795748c7fc1fb87c6c74f35d7412
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 and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and SEO poisoning techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=how+to+get+rid+of+unwanted+pop+ups+on+android+phone PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614093fb9a42c---78869672353.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xotep.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/3048013407.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140ad584fe6c---8246138495.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/56964649665.pdfIn PDF document text
    • http://bluebossa.pl/files/file/23412588525.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/nejuxafedijetosik.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-11/ac07bf68f5636afee0f66c3aec9261df.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/63888354701.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404561c0e82---46770967374.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/sekobanososivagam.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kivonavekuzikiruwirino.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/1768318672.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/zusanidefipep.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/21124678595.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/14426594506.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vodalel.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/87816413969.pdfIn PDF document text
    • https://camphacement.vn/upload/files/87170853259.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/43458920773.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/38486591854.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210906_185515.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f581eb6d---51684683934.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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 10908 bytes
SHA-256: 3756fb48f55e42e70d6e7aa0818f28718cd0af8d252087dcf3761a8616294de0
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 17788 bytes
SHA-256: 835ffd4fd2d500b938b0f9dfc8d35bad84e72f0c29a805d6b18c4608f086693a
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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