Malicious PDF — malware analysis report

Static analysis result for SHA-256 c705ccb7da4ecc63…

MALICIOUS

PDF

93.2 KB Created: 2021-08-03 18:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac92b48366573a1708ea6a7f924120c2 SHA-1: a14424b23b43cc0febc3f73a8670587fa38e3713 SHA-256: c705ccb7da4ecc63ff0ca525bf3923dfd55b6250d35150ea5d263fe97a6d91c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075873b0966b---juvor.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e67bfb51454---butelaboxukanomerigepoz.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39a1b3740---90320320364.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/de8344be575a22c9a263b8b602bd61b9/loritolalipesigomikop.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s8qs197qrgsenq2dpfc0es2r7l/48736922494.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a726b3ce1f9---bitusezukejofodare.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8930225edaa1de79ea84c433dc98960e/9863643702.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/ziwafumagina.pdfIn PDF document text
    • http://billsky.ee/files/file/68695084192.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/getevesenewufitemodo.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/98290853595.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb1743162---88420023906.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/57361544159.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hf88q1llt5gq41kjs2nfq2jbhu/34626853349.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/26616868605.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7790de4ef---kaletibeluburum.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/mokekejerugigekukad.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f785cc010e4---50493729608.pdfIn PDF document text
    • http://mopron.ru/upload/files/26097319375.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beff1e9a263---xejefabilud.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e669e5a1215---galebul.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/mupozinukebilabutedinidit.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/222dd51f0b4d6453b5775eb51b3bd434/karefita.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/zemufikowavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+whatsapp+plus+gb+2019PDF 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_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 18248 bytes
SHA-256: 678a9ab3b440befe4dd0d1d0346de767444aed0e6588454e3b00973d47386d2d
font_01_sfnt_off000132f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B07 11128 bytes
SHA-256: 55164624a526f794f5ff98cf8fcba6ab0a2316970789f698e414ad6b444597cb