Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2428dcd900d012…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 14:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e260b2a0c9a469ca1d0d6da1ab781b2 SHA-1: 83628d835f414c20da7cdc81593b7b363d34ff34 SHA-256: 6a2428dcd900d012b910af4b9a03d9a3744f09bcea34fdfe9a860191c9673cba
196 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. It contains a fake CAPTCHA lure, a common technique to trick users into executing further malicious content. Several URLs extracted from the document point to compromised CMS uploads and link farms, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://casaledellasignora.it/userfiles/files/pavetavojugatonu.pdf In PDF document text
    • http://amongelite.com/ci/userfiles/files/zevul.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/32427970014.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/52388477855.pdfIn PDF document text
    • http://husplaza.hu/editor_up/721095836.pdfIn PDF document text
    • http://thegioioto.store/upload/files/najir.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140322506ab7---46334863964.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/witapevagilufopifi.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/16090272516.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109161006492274.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/tejobanilo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2c5cb328b88612c7447408106478d138/wobubexin.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vg9p766k8gb2vbvlo85dsgblem/fokejul.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/nobaxikuxedaxi.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/xitemenezimotokiberida.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/vezoz.pdfIn PDF document text
    • http://goldmustang.ru/files/files/nodat.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/4437924055.pdfIn PDF document text
    • http://theponghop.com/upload/files/62483434470.pdfIn PDF document text
    • https://photofetimages.com/posezirulipotebadelepax.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/zaburowugenipajefo.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/33724782857.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6134c2c5c735f.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/92390149143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+license+verificationPDF 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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 18616 bytes
SHA-256: 9ad333165417e8974e646f8cfccdf88eca05f8602a6b630532280d54adf10311
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10612 bytes
SHA-256: 591901077482d8d5483deea3fbf5d4d0f854b6501ba607d3458864778a075de2
font_02_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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