Malicious PDF — malware analysis report

Static analysis result for SHA-256 9809b991d8f91d8c…

MALICIOUS

PDF

74.7 KB Created: 2021-06-11 02:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eceb25ddcc7ddfd8cdf6497015ea5258 SHA-1: c055bb4e3eb344b4f54227f9809229aaa2e093d9 SHA-256: 9809b991d8f91d8ca3b2f4f2cecaa93e39bd503cd2c62aa4652f06784ecf51ab
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=sample+of+application+letter+for+employment+as+a+nurse PDF link annotation
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a26d74488---2335232874.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/39644248858.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a4b852b26a0bf7676fce3b3ed189cef8/54888878425.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/6alh4ssaarplnsi7uaq30cr9qa/jubesafujixugonanapo.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5c47b010---76759223807.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623a104f99---sonugi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vegolekabuvojipise.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/28298273301.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/15082922542.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9b71af8ab2a44bae3d1a83acf412d117/40908053881.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d285mkc45a9elrmm0kmij2qpi2/pazifazawamiguseni.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/in8sr2afrgldqmcmkqtai51rnk/48573322244.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/nodesibevobifudodikisuvi.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/sujorodutuj.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/joset.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0d2bbf53---zazuwapuwefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 5364 bytes
SHA-256: 1304fb3adf5b00b512ef629d4be28655316f37d0eba49a3c697fd80b30bc4f6b
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 10736 bytes
SHA-256: 4227283f4d01385ba4d74820cadfaf75ce577d56b027548ed5d857c9fe7e4993