Malicious PDF — malware analysis report

Static analysis result for SHA-256 772062702a5ef7e8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 13:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba2cfce9479bb01166c8738f3df012f9 SHA-1: b526744a3d0406dde835b9e07d7356d792f1b34e SHA-256: 772062702a5ef7e8e529f798c41f101c6972a61e415e5d8e7bbdeac8c4a2a889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356014bc052---63298498618.pdf In PDF document text
    • http://packturf.fr/files/96319843385.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/35491097506.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543c52ae39---74413504893.pdfIn PDF document text
    • https://wonkingchina.com/d/files/61020643739.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lkd55t0aa3h09a8dc5la72vkh7/buvejonoluxegife.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/tepatubofizu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/somaletaf.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/bifonodafaluwiwovora.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/49151249217.pdfIn PDF document text
    • http://393citizen.com/upload/files/64041362934.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/tigexazodegoriladilepak.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zepotufabafabenej.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/17639755024.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/34502785443.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/62623545501.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/gotizuxupekelofe.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/97969556754.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/viburu.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/13072796175.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12508372538.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911024514.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/57475387347.pdfIn PDF document text
    • http://wych123.com/upload/files/totanukezukarifesiselebaw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614141565acc2---38358247555.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/bujogiwumazujebakukuw.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/sotisezuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=app+store+di+androidPDF 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_off0000ba1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1C 10320 bytes
SHA-256: e399d7901ce88952ec7e0a6bbb9056333ca1ef913a0529f5280fad19f5ea108b
font_01_sfnt_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 16904 bytes
SHA-256: a528b65a365b6c4bd9e7df689e1497d5f0003a956599696a55b7e32791f902f7
font_02_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1