Malicious PDF — malware analysis report

Static analysis result for SHA-256 9587ce2a780a2b18…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 15:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5044554ebcf483c3ee4158c7c56de52 SHA-1: 34dc1c463c2f82b3303a2f2c1636f2da20f0368b SHA-256: 9587ce2a780a2b18d714a5b163d2600bb17b248db44e75db008694ce6c7befd0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The embedded URLs, including one that appears to be a redirector with a UTM term, suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://seritour.com/rsm/files/jinevizivasuwadapuvoxub.pdf In PDF document text
    • http://citadelcaralarms.com/userfiles/file/niroraviruxepe.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/97015261369.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/88129787209.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sovasibi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5bfa97f01---furuzutarudi.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/zujem.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jjndlhq1dneo0us59dmdvl0rnj/kajorigekojiruwuxe.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/razaxu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/faaba1e58af167a77a3347f15bf6f22c/89048493685.pdfIn PDF document text
    • https://actor-conseil.com/files/file/12307576804.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/13786135175.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/57336217768.pdfIn PDF document text
    • http://epplast.com/files/file/girisirudevo.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/zopanewixetutopudebow.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/44283427650.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mqq4kededhg31gel9je7n06s78/jobatasevuxefufiratuvub.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/420a01fb80a34d2463526138bc4b6efd/nabelalenedozeguwoziba.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buwadopupelumi.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/05/kamipituxovoxulobufa.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/16499033119.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/tenalotuk.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_ACCABE28A4B0E4BA.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/16270586235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+sdk+install+directoryPDF 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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 10552 bytes
SHA-256: b25953da01e38c23ee4d8af7058ff0a34be474e2fd0ef092cfcc0e76c8892e18
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 18140 bytes
SHA-256: e0eb55cd6c8d6ad069524aec667214d1f21f8db5a5b9cbfc8b49891850bf6073
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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