Malicious PDF — malware analysis report

Static analysis result for SHA-256 4460c1b35175546f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 11:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e5f1ff84916be8d02933846f552aaad SHA-1: a87904fa5b04520c2d80a152e2811600513b1318 SHA-256: 4460c1b35175546faa38cee894434b49bb23385e7c21327a6dd9019df3334e7f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://faceconnects.com/ci/userfiles/files/23144355219.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f467ba002---newute.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/71450082306.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863d0dc513d---zemasesezobatejeweg.pdfIn PDF document text
    • http://www.polni.si/Images/files/tesaluf.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611489576c072---64722427730.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161125b235228f---15641484506.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0b703635fa3077639130b7476dfa586d/jelokolejeketobasagamexad.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/60543544577.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ee3dc421---37319722197.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/ruluzuzareboranivolot.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef1fdc5e5---xonokasuwizi.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/15358759120.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8588d0e07e---wibusukugurotomizejigi.pdfIn PDF document text
    • https://medtek.vn/storage/file/58175138008.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/egs466amo0qqan2ua3dh7in8e1/48988237578.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/88888728005.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xozixatofuvajukuzel.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b7badc142f0e1f52d1dea4706abdbc01/41825279031.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///54777056628.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/diviluvarawebi.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/20071135979.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/sirapowuvo.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/58026993533.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/katimisobeguvovowowojuje.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/68569164785.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/dolemeligevukawezodufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tassimo+coffee+machine+manualPDF 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_off0000be4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4D 10464 bytes
SHA-256: 41591a95d0ec9dc31ca4aa931ab678e68030310b1a94c8a41df10fe8cd00a27d
font_01_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16100 bytes
SHA-256: 2d8432e728f52b8e25cc34896e24f3195fdf09367df2cdc734389d40acb096ed
font_02_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1