Malicious PDF — malware analysis report

Static analysis result for SHA-256 993bc58ef5e06d33…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 19:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d72891712353daaf62bdf2d97dd6546 SHA-1: c0e66c85531dc7ee81ff551a7900007a27b34334 SHA-256: 993bc58ef5e06d332f70b112a2743f36e8d70a7b8c3782c2a37d9f42c06a195e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites. While no scripts were extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e95769a2bfd33c0c9d9a92da30d8447c/rewolere.pdf In PDF document text
    • https://arzhosting.com/calisma2/files/uploads/63599428758.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/15798156355.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a317476d---binodokusux.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/62105656034.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/zojosujesibadamuxe.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7a2cc306---pufuwobeleteg.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4b27968cfda76176296fcf0abc86faf4/17928983307.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/keruguxuzudosil.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tuvipip.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/57499743389.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/godopagumuxexipov.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nutokadafazag.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/69441416747.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/miribepafobidoruluvetenir.pdfIn PDF document text
    • http://soupworld.de/upload/file/49750956200.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086697f4ac5c---junowemuwugofupux.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tebowavubamibisolosuw.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/45346448234.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/jejovudefugezipi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c06378572a114e8f20d9a85172ea9cce/15682657462.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6pbbrfb3aqnvv5majjuc6lca1/pulujomaninuw.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612678eba81c3---87669233361.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a819dd55ec---18995143387.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/tujazaxunebozozufelod.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d253988ff8d---xumin.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bcbb03904---dapaxofujavumatovenebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=upselling+in+restaurants+pdfPDF 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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10660 bytes
SHA-256: 820f06ecfb0eebbfcee42f69a9dda34a8361ea59f0344428dd0d93b09215da91
font_02_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 17576 bytes
SHA-256: a15ac4adee13c239741cb44ce400ce5d46489c61816aca232eac74870d1cb350