Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee60d8522241fb19…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 23:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1d4361992390373184dd0d8b9e5a66a5 SHA-1: e16192680c9bcd3139a33c51eb150a021f7424a3 SHA-256: ee60d8522241fb1960d08961300a5d2a9700d1d54402b91a8ca66ee5d1747760
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://biographiewerkstatt-singer.de/userfiles/file/fuputatumin.pdf In PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_AD6AE38C8F8E6470.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/228bf393a6e558d6a70f21d0e5edf1dc/posedajinaxenewolowadavar.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/zerovoraratupulipan.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/goguwilojizup.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7d1edea90---39343994330.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/gesajugifedamamoju.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sovivatibux.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109241108568540.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/1338344124.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/tevojoseb.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/16531037807.pdfIn PDF document text
    • http://cke.hk/userfiles/vugotexumumusegogewil.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/82930977588.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/95687316112.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/guganonewusuladuzoke.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/4946064961.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/94915419689.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/gapukata.pdfIn PDF document text
    • https://finliz.lt/i/File/75770550978.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/41916082840.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/363fcae88ba4a1a82e133b49e148997f/delor.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/relovenuxu.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/16282601962.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/xajorepub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gb+instagram+latest+version+downloadPDF 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_off0000b407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 16684 bytes
SHA-256: 85e525ccb6a7c351b5798dce96c5f4269cb87ef352b49f7943d801cc72b8202a
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10924 bytes
SHA-256: b77fd7ac7d93a14c152068d319b985c96d064faa68c6329de8a13df177d1f437
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1