Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef97a142ceb8262c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 04:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 050440bd7eabe6d38f4338903d1c6b46 SHA-1: a00781d5359f603bd5d8c84557123f854ee6948c SHA-256: ef97a142ceb8262c6c06905d74ac832a344632f7a35fbe000f2d3c42dcca4d31
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to compromised websites, indicating an attempt to deliver a malicious payload. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://simsvizag.com/admin/uploadedfiles/file///jigoji.pdf In PDF document text
    • https://sanvexe.vn/webroot/img/files/92438960257.pdfIn PDF document text
    • https://promise-land.com/upload/file/wetokebukuvuxukisad.pdfIn PDF document text
    • http://packturf.fr/files/60414091466.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/81968822675.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/pagexilesepikom.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/15748535820.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132000fe8141---bamubej.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/vabomatimukotivetu.pdfIn PDF document text
    • http://attlas.center/userfiles/file/76506392286.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/gatafirizapisijij.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/44453367749.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/sikudej.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac308dddf---tarasoresevidop.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/pebavuwa.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/25488919485.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/13646745586.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/22518534273.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/62658788571.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/nuxirulo.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/88023197537.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/wasalobawilalafitevuxofi.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/voxibinerazofalusew.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81a9cb2a7---barurowatig.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/rewaf.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/bagexemibibigivof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=app+lock+download+2021PDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10368 bytes
SHA-256: 979449214f6a63d184e60bf236d166f342a4cee103d4e72991db34a1c9142d49
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 17984 bytes
SHA-256: dd3c12e2d30a347d30c028ee231c764e53b36b4cb59ba092320e8bf2c6d08895

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