Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc61da687a79d521…

MALICIOUS

PDF

216.1 KB Created: 2021-08-26 22:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 550fcc76fb408c88ad51dd21c4ea345c SHA-1: bf30160623c7c6902ac971af3d050715d0e111d5 SHA-256: bc61da687a79d521111f1da1027d45d5006089169d970b4f1562a0d20270002f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to a compromised WordPress upload directory, suggesting it's part of a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

Heuristics 5

  • 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.
  • 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://dalaichau.com/files/ditipukoduzuwopovativa.pdf In PDF document text
    • https://samoinstitute.mn/uploads/assets/file/bazapixolefu.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/43492778437.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210530002603.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b689b755300---57681006554.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/zumoz.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/33541901431.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/fewigegaxi.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/16472067336.pdfIn PDF document text
    • http://scpt.it/userfiles/files/61979461951.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/85832418831.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/metapalixifoxemamileseb.pdfIn PDF document text
    • http://www.puhito.hu/uploads/verelim.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/vufexoxugidubimitoxeba.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f59aa852---kuluk.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ef99b00f---74180120132.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/29497457778.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/tusasojubovuwera.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d0f37693f36767a790dc9f435e9bf790/43394326974.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/narumefik.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/66be53651b888824cb877e1d82b5c735/rurifosidazizopim.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/87va8iq4db1q5iq1e0gnkdsch9/jevofab.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-27/20210627202453157297.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608953756b863---73341234868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=solve+for+x+with+exponents+calculatorPDF 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_off0002f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000308d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308D7 11008 bytes
SHA-256: b333866024935660e29e27ab5d85a92a684f3a3d19c0a3e1995e2351cbec66a0
font_02_sfnt_off00032271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32271 17832 bytes
SHA-256: b37209ff3de472cbddb2e2ab8be3f8ceb086baf7ebecd8d31b71d4033ae4ed1e