Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2b7b81ca484d84…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 174de796470106b7c42c2e3b7844f7d6 SHA-1: 69307d88a34756edf391851a7238a4b543533a78 SHA-256: 1b2b7b81ca484d841b25a97905ad1e8e4deb24775a62422bd73e022949e710a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high-confidence ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vizit-k.net/uploads/editor/files/vopisexilujodumojaxan.pdf In PDF document text
    • https://indiantalentjunction.com/milan/media/dekowe.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/varedisabaseripeluvug.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9d3f218---66645398029.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/bufopijobu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/71f865596c6b42b9fc0f8b8899368338/83820671380.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/pitovobunosiberutibodo.pdfIn PDF document text
    • http://beijingteye.com/upload/files/16640179376.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/putuwawi.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/41990063388.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/lubirurusawokefasaninu.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/pivotojelilulitinulexoz.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af6d7762e---47570289414.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191101041.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xagufodupegijexix.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/mewodur.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/83049490005.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132270c69c7c---lises.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mabusazibupoko.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/kaparuzomigogukalotix.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/55751086435.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a41279ba5bc1bb81114802f23a043a01/pominiwoviz.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903050141.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/70592316144.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/99011993604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+meme+maker+apkPDF 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_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 17832 bytes
SHA-256: 9e76a24f978844cf87075d8b0763474aff8b10d81495a12ca0b3c351c1addc48
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 10376 bytes
SHA-256: 881648855b32769d51306d6e5877873e35619bdf09b1daef4201f8b98033520d