Malicious PDF — malware analysis report

Static analysis result for SHA-256 150640c74f76b983…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 14:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92f013c3b2fea8615b75544026bcb698 SHA-1: cc053b4bbe780e0b244ace1973dfe641c3545113 SHA-256: 150640c74f76b98327c5cc5af5eb0a918f771ce00aa6d2e0d49ce0929be3a123
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=ubuntu+shrink+pdf+size PDF link annotation
    • https://bczenekar.hu/files/file/80220538211.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630465214.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/81269545760.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44432862738.pdfIn PDF document text
    • https://cecprint.com/images/file/55610796114.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/bidafekafidowobamanenifoz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090423014755.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354da4486a6---17896952075.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/90494683860.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/lusitufel.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/35768428060.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/17694446383.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/tisisi.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/polutu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f502aafa---99158550232.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/menomotumopoza.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xelofobofarebemosufuwifil.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/66075502606.pdfIn PDF document text
    • https://duel.pl/userfiles/file/bovefexipiwokelijinati.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/dipuzutivolajudosezukukeg.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/daa5e27659a774d431009647996d0fa0/33360875327.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce1490af2---89285679302.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/wagomakuwemunadepo.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivukus.pdfIn PDF document text
    • https://naves.cz/res/file/66359573981.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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10664 bytes
SHA-256: 60d66a9304694ec7ca752b8cc220f55a9a9ca149b121fc84f3aff420fb3c54c1
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 18964 bytes
SHA-256: 14f98bdc226c8c6b964dfed67a835a8e70c7b5c397d8a65c0c5ff547be3817eb