Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6d78ec8045fa15…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 15:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ec044147ba5e2da1572115824bfdd82 SHA-1: 822b19378ae1eef29780243671e175e350fe8aa3 SHA-256: aa6d78ec8045fa15c8186b09cdc4540be290396f8a3b4a457b9fc45a5632cdf9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=asterisk+copy+paste PDF link annotation
    • http://kfoodntea.com/dataroom/file/42797503530.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/69508250038.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210906_120056.pdfIn PDF document text
    • https://costarica4d.com/contents/files/vikiwezuxilubumokuvajerij.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6135224D5D6E0.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210917061242.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/19265013348.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/86786578454.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/nenimubejike.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/46250583434.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8968b00d0---70639418732.pdfIn PDF document text
    • http://dezis.ru/uploads/files/14910566397.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/domesalajuxaludafufi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/jamutizadi.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/74259968462.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/ronapewe.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0846c1f8de79d3ab89b40ca2c0904952/35657845739.pdfIn PDF document text
    • http://bulmarconsult.com/files/74443907417.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/vigodajidukimagujitezamem.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/53343056903.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210917085416.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/80898898796.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d96250a3e534bd05bcfd38de8243a1c/6197084971.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/73872167357.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b55f3b11---49785795424.pdfIn PDF document text
    • 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_off0000b861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB861 18096 bytes
SHA-256: 030414d494a007a939dae6a9c7f988b45bc47f182228c23609a0b4668d5ebeef
font_01_sfnt_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10404 bytes
SHA-256: 0f4b423a33d21fd40329141f6f11a1c75211bd1e6d411085691672c90df0abb6
font_02_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.