Malicious PDF — malware analysis report

Static analysis result for SHA-256 542ac2f04e85bef7…

MALICIOUS

PDF

67.2 KB Created: 2021-09-21 04:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cca02aac1299636901be3df9b009c57e SHA-1: a3d528bd5970a98664f3f2df7f5c56e4d37c4d5e SHA-256: 542ac2f04e85bef713c0a672bad123e72528ca46258dd6d9497218133224f2e9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kpghomerepairs.com/uploads/image/files/kosivoxinejamurob.pdf In PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091722475273499.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/49797323775.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xadisozikijujoxidufezolep.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/zemuwekujelujupeje.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091110483270554.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219161927321083.pdfIn PDF document text
    • http://retrofotr.cz/files/file/82447611840.pdfIn PDF document text
    • http://vodnik48.ru/content/file/jedubutisonekeg.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e063be7ab4d4eea02e7a1910bf4b99dd/33181194148.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/gukusewozel.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210920_155943.pdfIn PDF document text
    • http://canoeing.by/pics/files/dinuzomiginudodukivuf.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c960edb06---xoribefisozi.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/gatozirif.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/jixusetezofojagujogesu.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/rudikilozopuruwevenof.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/tifure.pdfIn PDF document text
    • https://angkagenap.com/contents/files/35496959768.pdfIn PDF document text
    • http://bushurov.ru/images/files/mupixaxidelekixisokir.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/90fe10811e80c9eede8b9bb58d0a5c5a/35633820629.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zubugabipusasigenominot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kodi+15+android+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_off0000ad17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD17 14184 bytes
SHA-256: 2c6cd01664ff232a544bf140ae647621585f4386b946bd875e0ee402af09ab63
font_01_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 10104 bytes
SHA-256: b2fd2a1b641d2a6099cb84d23f40f51a129dd8775e7aa5daa5605f3285e7cc10
font_02_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1