Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12e08e192874135…

MALICIOUS

PDF

98.8 KB Created: 2021-09-23 14:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d38e2f0b910ad4dc914d55e8145abf3 SHA-1: 91a866072c95abee3bda7ca463b6946f4594a958 SHA-256: b12e08e192874135a6ac3223983439422361aefc54f1e684aa16d717c7ba3b7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=one+night+stand+2016+watch+online+full+movie PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4c664a1be---95853427189.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/38655041727.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/12698957922.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/94154276763.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/51100616437.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/24465615308.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/89927612176.pdfIn PDF document text
    • https://salonrewards.ca/images/file/78671542194.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344e6b96b0a---vokubimogeluworapas.pdfIn PDF document text
    • http://atrsara.ir/resource/files/digudutazakexafuwatu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/ravifaronutasumopajuka.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/99185295032.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/putarasetabo.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/dobaminarajofuro.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/zepazagufos.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/35879740189.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/widebosa.pdfIn PDF document text
    • http://balone.net/_upload/file///vadulagewitonores.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/71026314875.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jixetoriko.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/9131961743.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/46166012407.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rotiborefusujaronax.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/78407860226.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_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 18856 bytes
SHA-256: e3b8bb2186ff036958a6eccaa5dc1e39fe21be3bc650de0b52a58db2ceea4bb8
font_01_sfnt_off00014980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16197 11564 bytes
SHA-256: 156c6b5bf90b38bf9604d331c5cca74a5e8e8eea4e7434a16317c768ccbc6525

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