Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b13b1283b2312d5…

MALICIOUS

PDF

87.6 KB Created: 2021-07-20 03:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b6f91d3447f7e6f8abda66fa3ca7f57 SHA-1: 79dc74bc57e237199ffbf61cd9baacd96fa42fa2 SHA-256: 0b13b1283b2312d5f989b323a6ddd432e202f6105b8246eb2c4da85d67db2884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://noithatnhapkhaugiasi.com/luutru/files/jagenukijuvenutobigos.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814890ae49c---mifil.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/pikujivuj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-15/20210615045222661853.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ffa3c0c8bae148ac314f057fb6bc38ec/15083289437.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/88339ca5f7e4b5b3d3756c9b84e58dc6/tutiteramijikudixojozomet.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4ae26d07c2ee5b15b9edc7236cf2e31f/tonozewu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/m5vnmfqlip1i60mhjj8jj18qsh/nezavosetokixim.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa385c495---81194752340.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/4089649975.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202175511347137.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tpfkjbbu3hpuhe3vhs5f9vlbj2/79749505419.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/wisukilikifa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bee035cea---87131340116.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafdb12b08---momuxalazi.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/24072120080.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/32ee914ff836b242e1edd8de9f138b26/69488184923.pdfIn PDF document text
    • http://intrigantka.ru/images/userfiles/file/fexubugikodufemeg.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dbb3d7821d5d9ffbdf166bf18c2b4140/83725630318.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/ruxifipunilufesalowa.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc1d58fee---fesijifixuma.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7e919d84---6924502460.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/kugavusumizar.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f256fa1b68905dfdd6906be94dfade92/pavuwat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=willie+nelson+bandPDF 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_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 17096 bytes
SHA-256: 6ed949f408f0b87089012f1c94c1f61f1ac8a9aa47a88246398a201593751b4c
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 10176 bytes
SHA-256: a423eae46f3a1e9e0f118669734aff578841dd8c16e48d217aaa5ad948f4c5b8