Malicious PDF — malware analysis report

Static analysis result for SHA-256 15284ef6356f1eb8…

MALICIOUS

PDF

83.2 KB Created: 2021-08-01 17:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 629cf4b791468872f65535601428e100 SHA-1: b8cc17a3e07e135103ea508a23bd54c64af20041 SHA-256: 15284ef6356f1eb8b48fde0f929a116dc60fc08f961d97762b4b1493b7a403fc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content or to distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2990

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=the+21+day+belly+fix PDF link annotation
    • http://brainbond.ro/userfiles/file/42657948494.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/20022781456.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/fawazavafugemewituwosifi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021051802413414.pdfIn PDF document text
    • https://qnzar.com/files/5856104966.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d4770433605505f1b4f172d5ccc11ba4/48685203710.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95ad7c25b3---76170427500.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/4591645686.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/mabeviwexariduwupigaxol.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/48081884334.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/trcmkq3erla6i2v39lr7613bh2/96652823058.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197a7e0d8a---65976622499.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104caee04d6d---72563482344.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g17u9ic4bvieoaqdnhp9abd1n6/6354554447.pdfIn PDF document text
    • http://e-hematologica.com/users//file/putede.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/hutemfaccqn1t4prfi5gj6nc11/dasikonemalemituvu.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/zisuvimirikobudami.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/50921613091.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/85ad9ce16f4302319b2b9127504b10c9/tufemuzagolulaxi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e05b70ce73b---xubapiguvunuvusegoro.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec68b5f163---64432333765.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/074145de72177e06ad760f8a6c4cd2e6/mekuluzukewovuwo.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216171948593855.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/80885876053.pdfIn 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_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10352 bytes
SHA-256: 897fb7b83fe663ec4e01ebbfa244148fd758246025c99e7895c4e9d444c3f088
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 17680 bytes
SHA-256: 44c4b1bc871ebb8cc4c6e3a50f385f4529fc2f08f86bf2ae6c41d90c513d464e