Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b394fc702ab61c…

MALICIOUS

PDF

91.0 KB Created: 2021-07-13 00:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c060ecae6ec56c1bdd19e81b97c6239e SHA-1: c39006308bebe04546f20386edcfffb120d9b062 SHA-256: 21b394fc702ab61cd5d4e4e238c7cf1a51a26bace8dce0bc6fc1a52974119038
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/kuros.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2977198a---81900987303.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5265a50a21286cb40f9d83af881e439f/50253297239.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rbrjhbnfaigv6s41rgaqnkkmji/veguwogotazaxuzi.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/rudivarobukiwojeb.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866194dea40---pidabofisumolavegajugu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rivuwusanelufanaxowamuf.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1ce37779---45954418155.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/83407837289.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2aa574d3b---86075341015.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2efde6c1---92664448946.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/lomabubaxetaw.pdfIn PDF document text
    • http://coffee33.ru/archive/file/jifoguvit.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210618003227.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/80325715438.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b1fffccda814105802b6c19e3ad3da72/1098153489.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/27236057723.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607195842ff9c---90768311807.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dufusipifagezujozibiliji.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c30a4fc2c---24589793367.pdfIn PDF document text
    • http://coumert.com/images/file/tejev.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/74737836011.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8b3e9c9bccfc1c62e833c3a40d9618a4/wonepowatabugunetesunebow.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mopiluromokimipomuxak.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2003792feb5083c1636edba8ce9896e5/xofeporopikisubed.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae341776---lafifamavamesurinulilo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/nixekido.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/42100182737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=invasive+ductal+carcinoma+grade+1PDF 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_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 16952 bytes
SHA-256: 4f3dbee39b2f7085d0fa59ace120ae81b51e9c9c0fd504f903d490309deb9855
font_01_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001455f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455F 10880 bytes
SHA-256: b93745f194f81ee590888766bd8df439ba9c3c37426d304cd94ced4a16d3a631