Malicious PDF — malware analysis report

Static analysis result for SHA-256 21698f055c01f468…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 07:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cba6381feaff31cdb57eb5f7a1f22a1 SHA-1: c907b1453059a6f3dc3f5abe5d717c238845d9af SHA-256: 21698f055c01f468cddf4e406ec840b1509c2f7a54ed9eb467f9514b0bb81c86
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a3ee3856---92194228010.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa75311c4---53964705054.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/ketewavologusara.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd872a0e0e---9764294268.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/42719065865.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/5232675184.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/kagopebagu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/62069474939.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e3f0c2c0ea806d77096e4df8d5ca1776/pebulutevetapu.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/8201026619.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd582935b5---83608301950.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/k0i6ll7dmo5rj0gcc0e8vbcq28/58163039690.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/8640388106.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3fd7ebd6e2847c3525bbb23c2bd84912/jevimonopugebaxex.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/17145074602.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/falejatokabaj.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2b6166bd946644585004a1c0f385b186/95869358267.pdfIn PDF document text
    • https://chp-travel.ir/data/file/tizifadajuvulugupedok.pdfIn PDF document text
    • http://apcmagon.com/userfiles/niteki.pdfIn PDF document text
    • http://poorclarescork.ie/images/94791906011.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0bc1a52e0fd1ab2705259de20a184a27/75159517440.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba3b54f31---vejozawedelemaxelov.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cf9664fe66d88d2b4ef198e41c76a2b3/monaxavasiwawovamipur.pdfIn PDF document text
    • https://bnovum.hu/downloads/jasilupofejawede.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5d7c5b9d3aeaca994048c343b16196c6/17983826911.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4d1083372d3e8d6b864d0a0ac58d3322/35437547696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=catch+up+time+meaningPDF 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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 20140 bytes
SHA-256: 2fb94c222f4dc20dd046db5fdf3352b12da3ca86766c75f006a13767299f33bf
font_01_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 10520 bytes
SHA-256: 3e17f12045e14c83470a75f3ad9376ddc57d42f2dd8ecbce22ba8a5979c616c1