Malicious PDF — malware analysis report

Static analysis result for SHA-256 a000246cf17dac57…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 04:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1ce31aca79e48269886ac7fe91f487b9 SHA-1: f2b21418efe8cf8c32b4fd2026836318803710e3 SHA-256: a000246cf17dac57c7f787ecd0d5b049588f32dab8335d501950cdc8ccf59d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://immobilier-valence-agen.com/userfiles/file/61980315387.pdf In PDF document text
    • http://ri-rm.ru/userfiles/file/49454851252.pdfIn PDF document text
    • http://airfa.it/userfiles/file/12341273079.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/34635531469.pdfIn PDF document text
    • https://vpmemorial.net/images/file/43392707140.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/wilebuxo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2189385ad45e8c8cc3d58f1384896375/63404797022.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4e0a5e70b15b7532fd04b5e5e1334e3b/19161932291.pdfIn PDF document text
    • http://ruihuitax.com/files/file/1931337187.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ad99d2fb---53818424512.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b534a523e---ruzevufigom.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/71976571130.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/96781539741.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/60220340035.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/1514035596.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/35886784749.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bf493263---legozi.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zakemamowiruwexuberafuzuj.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/deca80d0ffa539b5c2d87f0b053ea9db/62140318653.pdfIn PDF document text
    • http://one9five.com/userfiles/files/42594324307.pdfIn PDF document text
    • https://geniodelweb.com/file/zewokipalokiwaguwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=predictions+for+tomorrow+soccer+matchesPDF 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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 18240 bytes
SHA-256: 14f9d4cd3d851b2232db53a821aef59875676095b1214956827bd686b917ecc2
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 10780 bytes
SHA-256: 84fc0dd6c2d84e366851e298193232800326e6a428c818e34f9cb4e8620aee16
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1