Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e3c2764df4bbf7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 17:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c1b75f91d516339263d3f738bc6758d SHA-1: c54aa8fe0840c432b60fe4fe6a1ba612c195a78c SHA-256: 40e3c2764df4bbf701abb0396366a7e7519aca98b775832b78d4428fe633fa32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=samsung+galaxy+s4+zoom+price+in+kenya PDF link annotation
    • http://rebeccaosborne.com/uploads/53400965276.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf95d2faa---58047204600.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/7585007177.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/15785566248.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/tuviwa.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/munikejunewabudefikax.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/masodofurig.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/davarizoki.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/95752777364.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/74464009118.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/mopanininudusedijotuw.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/21632638897.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lukuwuz.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/39070647721.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/1985921544.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/87895064180.pdfIn PDF document text
    • http://safetruck.gr/images/file/wowojosa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c424731cb---1108881165.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/sukesasem.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc4809c63---12569994844.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxowifelimuwozoniwu.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/48735213706.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/walikaxafosib.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/40060034909.pdfIn PDF document text
    • 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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 11240 bytes
SHA-256: d8702b889e34d96f359cc7f1d141275e66e32cbd9dae3cae06e488d053a77412
font_01_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 18816 bytes
SHA-256: 6bf8ed3dca31af49ee74abaae3eb81cc1ea2668ef543391198ccfb0d706ef13f
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1