Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee721da958c25f37…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 17:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7218caebe5227f0e71e8a8145c738bd1 SHA-1: a62127c344a7683891335f0175b17198bd042058 SHA-256: ee721da958c25f37662306ef942db57e16634604d6edb8cf39cd54c43b4b494b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it's part of a link farm designed to lure users to malicious sites. The presence of external URI heuristics and link farm detection rules strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=pokemon+go+free+pokecoins+hack PDF link annotation
    • http://banquat.com/userfiles/files/55758051410.pdfIn PDF document text
    • http://seto.cz/uploads/wofisexabibunefajipox.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/81402883721.pdfIn PDF document text
    • http://boldogelet.hu/media/33081475490.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/31162344187.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/45315dbd4e9cc80b65125692349a96d7/94410363710.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d796e3bea5---pigoterota.pdfIn PDF document text
    • http://ctm.it/userfiles/file/16447228495.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/19381532451.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/bepawixe.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/64265028893.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/pupoxixamedazemevalonu.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/podipazos.pdfIn PDF document text
    • https://blogsma.com/files/bosuneniximozufisof.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/56811287626.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/80983180064.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210901/file/16304914342632.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/wutexuxuxisedejagij.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/ludusegazolesavepavanem.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410c567155a---gewitunawesibi.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/mizov.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/67579019032.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/sexemewerevavadotezum.pdfIn PDF document text
    • http://mp-journal.com/media/file/lofutixekosodebuzutavur.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 18052 bytes
SHA-256: 5767d36c4f5be265f90d370208e50060d1e78a1afbb6d0b75c2a288c98e6c4e5
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10876 bytes
SHA-256: b6bf4897ce55effe0514a77af45037c0f5121101f86ef45e6b98d629e86c5f36
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1