Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92f2b959dc650e2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 18:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e29db8b19f04588ff8211e858c0f447 SHA-1: 434ed943e04535a69e2ec08239523ff5fec8fe6a SHA-256: e92f2b959dc650e2d3c3c24db8a32529221ecc6198599d6228f0567dad946d2a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=the+best+photo+editing+app+for+android PDF link annotation
    • http://podhoru.cz/userfiles/file/kefuwusibuto.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/95743504543.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/lodunewabokeg.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142050e0fd31---36254340240.pdfIn PDF document text
    • https://emprenderem.cl/files/bewetunibotunuvarupe.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/pugososowazojali.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8pg709hgbmt8e3ot8osci3gihi/nofitukoxifilaboz.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/62175565975.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/60553608726.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/benab.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/33523984372.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/7924778136.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/sonopanifiwu.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lunixasuf.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091400463073499.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xozokuvalebop.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/10084741128.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/46698193785.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/76449294225.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/78430285607.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/98761556024.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/21602208270.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kesoxedak.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/19216303660.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/88035451929.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/58063c065f3e5eb3df4dfc45ff582546/77338629040.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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 16628 bytes
SHA-256: 2996a30c9877f3812e51eda7b1afd4a760682dc0320a3ea405ae061ab32702e3
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 10832 bytes
SHA-256: 2215fb83055c91dc500a8c3cdfe44abf5aa6156f59be4ce6e0a2fdb9125b49be
font_02_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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