Malicious PDF — malware analysis report

Static analysis result for SHA-256 985e69f4a0ad82ac…

MALICIOUS

PDF

99.5 KB Created: 2021-09-05 14:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a6b584cba40cb4abbeca024b87f303a SHA-1: aa4622872d3cda28fc43e08d49e7a3abc2f8e550 SHA-256: 985e69f4a0ad82ac69a9302dc30d0361d9c42f89625beaa6c39891d5b3923cfa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, such as http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/947eda229f0a2a9cfd859dd8164928e0/pezedetezu.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://alliusie.com/userfiles/file/lilikavu.pdf In PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/razevixinavupoji.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/kisufefovelefas.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a17aa18d5---kudikakeg.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7a662a54f6f484106fbb6351e8565a1a/gofarugalemikidez.pdfIn PDF document text
    • https://tipresentoio.it/images/file/niseruterisaxavuzaleririf.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/didamasonutiv.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0cae4669---21834596400.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/visivojovaxusopomumofun.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/272108106329.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e2c6542135868d6ce63e7d610ed0a436/natibinabusuxenimuva.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/947eda229f0a2a9cfd859dd8164928e0/pezedetezu.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/ralugumorulakikanevu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/11408364363.pdfIn PDF document text
    • http://voijin.com/userfiles/files/21583290828.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b9e2b129---45198752032.pdfIn PDF document text
    • https://peterdegendt.be/file/88263179545.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10983cc677---23111840182.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fimatafubunax.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/wuvowijetativu.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/97241765396.pdfIn PDF document text
    • http://sowitech.vn/upload/files/rimamerolivozus.pdfIn PDF document text
    • https://pindimana.in/uploads/file/64467314122.pdfIn PDF document text
    • http://darec.sk/files/files/72118707737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=land+rover+discovery+3+manual+transmissionPDF 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_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 17804 bytes
SHA-256: b8f3a65876c6fce42529dbb2511de77ffd8ecf3abba7fe9b0c6586ecc1aa6320
font_02_sfnt_off000166b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B6 10940 bytes
SHA-256: 4ef0e49950655e2df3778392e8480bd1312fa7ba2cf2ff290dd20a65155a6786