Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a63d6b55285b7d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 03:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e9755d9f8b386988a69a1270140a10b SHA-1: ee8aded6dfb0f07027b193eb61d2bfc808cc3ebe SHA-256: c1a63d6b55285b7d9d088d42a2b76b217a3087edab25309305cc0cc9d467eef8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=kundali+pro+apk PDF link annotation
    • http://otestmanager.org/club/data/userfiles/file/20210912221825.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/or9n76fg281jj96c5esb3rpqns/97329545209.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/67a02bac641be67b571ba0aab0d80e3d/28541500126.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445dd084783---28959823019.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109151834248859.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/pawepaj.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/69688101157.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b5egsk8b8mgulml4tvgp0gq07v/mejisisagelizuxuk.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/digukilomenodezopimikefax.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/732f26913a3193c101cc604ab01263f1/besomokumusex.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/bikajeduzifox.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161387224e6800---mugivugusizapi.pdfIn PDF document text
    • http://prompol.com/media/file/24795094956.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/ramitij.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/gukatuxuvas.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/46884350670.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mesetud.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/sizazuwasaturavukive.pdfIn PDF document text
    • http://metapolar.hu/tmp/75033123513.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/sojosogabekurapiloxe.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/98186225310.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/3159517774.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_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 17076 bytes
SHA-256: 88a9d5da5e2f14df2ca1ebb522ae1670e3302857965f02bb4a801fa26c73874a
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 10168 bytes
SHA-256: 2ea1b9654c8da2ff65e3f39e2f3243e4fd19307a0e91c9669baafedd682436a5
font_02_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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