Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c277778a746f3a…

MALICIOUS

PDF

87.5 KB Created: 2021-08-17 02:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b1a2b557c2f5593243d096757289b660 SHA-1: 91d0c2af34f4da10b64748ddd88856d89ca2041a SHA-256: 92c277778a746f3aef9fd5cd72c2797b723f74a5151e9b67749ec98706dfa9d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://huntic.ru/uplcv?utm_term=descargar+libro+ejercicios+ortograficos+autor+agustin+mateos+mu%C3%B1oz+pdf PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/55cc1cad9d15b5152b278e6a75066a0d/89866260511.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/98uu3td5ns9b6bb4n6v79a39hp/xunupenizatirixu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/26693556508.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/lafitapafarokiritatol.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/demidinujafanagazadagik.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b960a4d9ee9---12010673726.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18fc871d508491bdadb96eecf6cb4c39/2611634579.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad8457a80a---22284227005.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/xikirawij.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fumameseja.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/194jobpebea8q1iquuj2hfgnsc/misezojirusafuxudusitojow.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/majuzanifatafobegemogeza.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210812_96695C3F2F605154.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/xolejoli.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/88377512029.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609199670d223---4058365641.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071825e8ddad---xonoruwumobe.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/belazem.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/xiwiwapexiwiv.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da41d4013---67241275510.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a989e7173f---zomipajuku.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0a5dd2e27---28501628031.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce61982af3---97000427569.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6159dfab1---gerexo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ade8b34f89cde8d9273f07f73665ae09/57863740097.pdfIn PDF document text
    • http://npas.ru/pic/file/81095957965.pdfIn PDF document text
    • 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_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 19356 bytes
SHA-256: dc38e84ee991c3bef65a15aeb889bd04730080650e6274e566bcf7dc27069e17
font_01_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B9 11600 bytes
SHA-256: 569ddd23a97acc39609e4b39860ec4dc73d4e62eb755e5e26dce8c554c8f1fc3

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