Malicious PDF — malware analysis report

Static analysis result for SHA-256 8931f9fccb9b71f6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 03:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50d00fdb1d9697daac52700f4224a405 SHA-1: 44c9f6e686e10f8a97eb3a118f3a20ba296721ff SHA-256: 8931f9fccb9b71f61b2626a1e8cf786be1a0303b0f5cfe5712384cf710fff3c3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161495ac0756d0---puzobitodepuwaduvovejisoj.pdf In PDF document text
    • http://sanzmendia.com/userfiles/files/56042675047.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uodhvj8cvtas9guad29mma1qt1/3080601792.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/nubelob.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109131107471558.pdfIn PDF document text
    • https://emenu.hu/editor_up/xakukedisepe.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/selipenuparijidelipa.pdfIn PDF document text
    • http://elitk.ru/_files/83373176943.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/suninifibar.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/tixuwanujojumufezelidoge.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gigawelo.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/jalulip.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/77798740096.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/61388518344.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/29730314285.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/35369917100.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fdec93a1---dexefuninusajatoxepotim.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/21171597096.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/93286302822.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/3284255074.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/filin.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/roneladutow.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/kizopeburonelokadatoxawif.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/zorixifuvegejimixemanaga.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/25159837342.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/459165607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=talisman+om+apkPDF 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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 10140 bytes
SHA-256: a75ea0958507b691e67aee041c06573c6ccbe687aaf6aea76c44a05e22bef662
font_01_sfnt_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 15080 bytes
SHA-256: 3ad100634dfea1276206c14811edbb66db3a816ce969e2ee90d8124a0b79977e
font_02_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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