Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cccb35b575ff71f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 01:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70f8482630a20d4a5835753fbf9bd110 SHA-1: adc23860f884eb68de9131965d7232f5b23a38b2 SHA-256: 9cccb35b575ff71f8b3ff75d59c5dd9761859c3a762bd7cdcac9afccad1f86f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://whitedwarf.ru/public/images/ckfinder/files/fuvolomevujoku.pdf In PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/krhp3gdo9g201lqcrcvrkbdmtb/wiludidesidepomakulasi.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/najevofuvoza.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6444e8174---57718716781.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d8487cea0---4728262538.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/34293920235.pdfIn PDF document text
    • http://stromzeleny.cz/file/sebubuvi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a9f735c2a122cd163e65421205bb40dd/fixupizodalifitawilu.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/17482409535.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/5802269985.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/cf95500b9752961846cf74821bbc6308/dirisuxekazebov.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/46137890931.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c360ec02---77799235714.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608527178eaf1---84075941120.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/16109097587.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/73467475283.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/94596161537.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/jaxapoz.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/sekutu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/de8344be575a22c9a263b8b602bd61b9/loritolalipesigomikop.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3868ea74f9---laxevifurugepejotera.pdfIn PDF document text
    • https://subarini.ro/mm/file/13885445644.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/vjf54ciu1jpq8qdmhtd3jvv02b/gejalozopedisabewosunejo.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/xebakoxisixanugoziki.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8a068bda---19998043581.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0646dafc7---zaberewajususezokalo.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1629309130.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d934e99d---77605483416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=resident+evil+7+xbox+one+cheatsPDF 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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10772 bytes
SHA-256: 1ac12c96c5a7071ee1e302419e6f673ac12148acadebecd65f58da64e5e57fef
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 19208 bytes
SHA-256: 735ec85b8bb49fa55c305ccfc7f87cd1a2a63d8e4a8374768b2d9479a07e674f
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1