Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c259ddebbe0288…

MALICIOUS

PDF

84.4 KB Created: 2021-06-21 10:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987c683180cc944b336e4150f8b982f9 SHA-1: f9ab0803a5f4a37783849fdde58b5ef22e5bdde2 SHA-256: 09c259ddebbe0288804ed626c64f40a79d197e15a111e3449a1a53d70e293507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/21b254114d99b5ca496da9e9192e1099/bilorevajuviguta.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6497ed9c---84983983742.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9e3cddbb0b701dc4382b2d55544bd7df/27381624167.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3da8cfb64ed54120ecac104db81fc30a/famodipukobafamiveduxas.pdf
    • https://hondamienbac.vn/userfiles/file/94721406099.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a03db108---posozu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f17404652---zemeda.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/newitebipozezejajuwitup.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/286776e5121810b96dc2fbbefb01fe57/xabazebi.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a1414396a86116bca1645008e214cc15/36561556460.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nc1qbf52aj3qvmg4f83tli5534/85073381429.pdf
    • http://ibtaker.ps/userfiles/file/jisuk.pdf
    • http://qca.ch/userfiles/file/72482381252.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0efaec46f2f30565d5bf2fbaea299d5e/kasezubedelujomugozel.pdf
    • http://ingenermarket.ru/userfiles/97372142624.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673e8e521---28615631124.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=online+docx+to+pdf+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da53.bin
792e288023e4fbe73a0351c4e4cf94c19217598e688914c0413f09f13c1160d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 6568 bytes
font_01_sfnt_off0000eaa0.bin
023b77a95c15497aba648241e796935c1a5f15d7a1b5506fe5a9391d2e6b9729
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 4916 bytes
font_02_sfnt_off0000fb71.bin
2531c7b7cf0e8edf2eba8a8c50726abaac3560d7c8cc1ca4eb7ce80bd8d567d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 3372 bytes
font_03_sfnt_off00010975.bin
2b944198b725b8c247289b7d9d6501249e99db6bdacea399b28b57a1c45523c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10852 bytes
font_04_sfnt_off00012e92.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16036 bytes