Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ff46afca3fbc4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 16:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7da1dbd6fb42a594e07c5f57969deec8 SHA-1: 1df1dcd195172b4b20b88dece3e4cd66c8278e18 SHA-256: 4c1ff46afca3fbc485f2f1d74db52d4598461a0ad3d01cacf907bc0d7b1e6d6e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or serves malicious content. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/57172d7f53967e5880e84bb04d42e712/42997421383.pdf In PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/kumitivogipinuzivebon.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ef52e396---liwemuxuwaduzef.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/58928072014.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf2990f93---ragadeju.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210801_FE4E4D680FB20963.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c098979d56---90544140474.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/65474141033.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fomalanenedurume.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/89341192210.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/o1ip7pltlnghklc8j2o7650rl6/tutobotunamuzeg.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/popefawodabi.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/poputijudomavixani.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/68226193908.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c5mk0p4jgnemum8imqi08icd5h/vifajimijavexiduzulowu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/13230318736.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/zifalolimusebemodenipa.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072917383173499.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/63212933171.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/84133345068.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/xazejile.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=electrolux+insight+manualPDF 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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 17948 bytes
SHA-256: 372ee59d1e070a872e2f9abf94dc54eb5ec5a7cfc91eca0ca02043169ac52f84
font_01_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 10864 bytes
SHA-256: dc0a79d0499ed0b958a6099e3a8d325560fb7af6974345e5406d8bb42b01dbf2
font_02_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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