Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa107277e0ca04f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 06:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a9842de3b9bddf85f930b6d13f67d6e SHA-1: 39ee9f1cbfb799b54e72cff53333e9b1bf1df292 SHA-256: bfa107277e0ca04f18065d1508a3ca0055da82c4216680bf472d999295747aaf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or to download further payloads. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://szerecsen.hu/editor_up/16886934059.pdf In PDF document text
    • http://kgmda.com/upload/files/99053515024.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8koidr6lrbe8trcb73nquuu71s/26987217020.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f771c5425b4c600e8ab1676f0f071149/12154405868.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/66650180947.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/kapulodevojonevifozemaro.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099352ac80bc---tufurawomisuluwuxipebigil.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/2c768fd949062b81011443d3a981c646/doxetosepizibapiseref.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/zuxekukutuzi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430022132651553.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/kabozawetuf.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16097f619472d2---revosogototora.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609422aee1cd1---17456487670.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28894bf3c3---92436213158.pdfIn PDF document text
    • https://shidoremicrosys.com/media/96280268875.pdfIn PDF document text
    • https://tipresentoio.it/images/file/52407533244.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tticiiujdmui980tnn4dtpept6/94189661365.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1434206edb---79836530213.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019a27bdff---11585995396.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/19905298487.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb9c8ad515---xewisudalutuzivida.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fe1d7e21c---19495647183.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/80390381295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=computer+arts+projects+pdfPDF 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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10800 bytes
SHA-256: 731a85328bfcfaf63bc89946e17c0caa458e1b410ca331dd641ebc3f8fc1cfcf
font_02_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 16292 bytes
SHA-256: ec97bdce2af00f924e20d016646681c19073b6ed2ecb8fee257a65b0984e6293

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