Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcce5dd3d0c49d32…

MALICIOUS

PDF

89.1 KB Created: 2021-09-06 22:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee8944dd93505e8e575cf440767cc3eb SHA-1: 0e1befde499624195756f0f393e41b40ffbb6299 SHA-256: fcce5dd3d0c49d3298066cb7627ccd6d22c4372e945bbe4a841f66da85055925
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage suggests an attempt to host and distribute malicious files or redirect users to phishing pages. The numerous external links, many hosted on disposable domains or compromised sites, further support a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/ In PDF document text
    • http://nakatka.com/files/file/78034650163.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a748e03d7bf---titomotisopo.pdfIn PDF document text
    • https://ksuskalology.com/images/file/nigeputidevugunufog.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/58198321115.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/9333212746.pdfIn PDF document text
    • https://brickzoo.it/file/4171639977.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a0008e463---10817126287.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a9fe2901---99491867988.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/fudozepasadaxivesavobibev.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210709195045.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8260766f---34966469300.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2108250628134371344g8wby.pdfIn PDF document text
    • http://gapp.fr/medias/files/pivuwuwafoluwasexugipuk.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cab9e948e92---disodiguzepasamuke.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8bhp48f41f5vc2in8l191vcbh/jijusun.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/92875572361.pdfIn PDF document text
    • http://nktrading.qa/file/files/xabarewivubiwulos.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/33363526872.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/posifowuxenefulaz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/478635f678b1aaccc5b4b82a433bda7c/tefofusabuzozimodi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f18269c881ab38942cdaab5bd2c536e0/bilaj.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/92635155022.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/92103902372.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/jexelorezomifipor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=parts+of+a+plant+grade+3+worksheetPDF 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_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 11036 bytes
SHA-256: 30d1f5ddeb8f903bed8fdf73727d952050f6ec0e7c29c2b2ff569fed93e3e649
font_02_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 19184 bytes
SHA-256: eb6c161919c8bceeb0368f35300c0856c5f975bf3284dcc3ddc12b1ee5586aae