Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a60d55c149ec11…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 08:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 983fdc65d258e23a18c7f60260a5f419 SHA-1: 55af6e0f553b84f09d1d9de914b24665714e6a9a SHA-256: 13a60d55c149ec11a54e414e42b5927f3d951904e2e2a868547b170017e54e77
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown URLs, many of which are hosted on potentially compromised or disposable domains. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kakakmanis.com/contents/files/37742009128.pdf In PDF document text
    • https://davidfoleyinc.com/userfiles/file/sejudurosexegutiz.pdfIn PDF document text
    • https://ms01bet.net/contents/files/57088702113.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/sexefanifadunabituwumud.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/19442897468.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/22876857004.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/39276828287.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jikaxoziponokezu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/34345421406.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16135e127d9f44---6340891775.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/mufawaxipesedoxan.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/vafigilam.pdfIn PDF document text
    • http://soupworld.de/upload/file/30400736543.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c524e1d94---darewafexuminefi.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bixazavifasomaxekilamozu.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mulagi.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/85122613077.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c93f56ccfb---bedutiriguxefutokedowasar.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/wofizadokumemu.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/guzedigodumun.pdfIn PDF document text
    • http://ipceurope.be/assets/file/kapemak.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/21617804105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+willpower+instinct+book+pdf+downloadPDF 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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 11000 bytes
SHA-256: 5a3c80fc882300e7f7380a12da1047f6fbbc3c2288fb88b98bfe18ca5d1ac8a3
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 18176 bytes
SHA-256: c38c849255e292c0b3b74ff62d364bf008469e1289b64c3f129c0d2b46669c10
font_02_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1