Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a733943a09dbdc1…

MALICIOUS

PDF

96.1 KB Created: 2021-07-24 05:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8301b7ebabc94bf93cf414d4803cfe2b SHA-1: 3f45edaff7f13a081cb827cbcb9226266be43495 SHA-256: 4a733943a09dbdc1c78b1f97ea0c0f6099c4aad9f92d0cfa9b9970d4c5315c83
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or further stages of an attack. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160717816dfe4c---69613972236.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90084104327.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3caf1357---25376596695.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/99k97fnhes86s830dgqj8rk211/22122580309.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/922icou2shpmld66nqldo4fh4f/46233371550.pdfIn PDF document text
    • https://ferropula.hr/files/xakibuzewurutoxoliwob.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723bd1967c---45338669066.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201dec4d90---sunetamupisowiroj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1d8e518a2dc18e2b8af95648f6941149/98317013270.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e5766519e---50931402747.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9247190536---73614385493.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fa86k2tsfji0kshrb3ur3hhudl/77210881964.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/26131593731.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb9acc379---lituvizikowe.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/00f3cbd23858b3256a1319a882823188/67531703201.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/29506980915.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/wogugotosopekeguwato.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/45339433926.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c527c5ab1---malusajumolivagog.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/gudugobixijevupekave.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f80e2d3d83a11f6c9664276b992fa547/34359091243.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2dcca378---63051432171.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gqgjihr11t3t4otdfn2dfivcr6/mizofuvikalefuvodelinobi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97180721539.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094837122b5e---54248215505.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/90039985585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=porque+da+infeccion+en+la+orina+durante+el+embarazoPDF 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_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 10916 bytes
SHA-256: 5e5fff1832557d3431e933cfc98161d44300eb8619955055926590160ae749d6
font_02_sfnt_off0001417e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 18096 bytes
SHA-256: dacaf505cb7e0b985a34bb6aa71cafdb61f4cf424aa715a9619cb4ad6120f8ad

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