Malicious PDF — malware analysis report

Static analysis result for SHA-256 8982a9cdb78c301b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 19:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffd32b322210a8cc013e28fddb323b9a SHA-1: f06003ad04170f38a246f00dcc8b80b88ce0a085 SHA-256: 8982a9cdb78c301b51b88dd91224b0155ef7148cf0487793ad73dfbde788ad5a
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports this, though no specific script was extracted to detail payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/69442984296.pdf In PDF document text
    • https://infrastone.com/userfiles/files/mavovage.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/39822545304.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kikusavafujakodazamavo.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/91970285534.pdfIn PDF document text
    • https://pecintajp.com/contents/files/41651414311.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/xitudedanolixowujas.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/46514389067.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404462b4024---tinejoto.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/wukine.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/6934053934.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/91150406068.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210905/file/51469478920.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/lodefivenuwupumufoligixez.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/jonotawuxiso.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/zimupefujepobafune.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/97818901510.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/92207435718.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/84717001784.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26e2c7fc---48779257828.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4hjfit6qvcakcqhhmvebquf410/1775089656.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/xelodalimejewel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=swords+and+sandals+gladiator+2PDF 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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 10572 bytes
SHA-256: ad5f2b39f61568f038054cf3ce826b8a426f0ef6ef6702d9b8b110963071a7d3
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 18560 bytes
SHA-256: 4fd29d53f32f9f3e066836415e203cdbd496e69c36ea1ec850dbfcba0a37f683
font_02_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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