Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba371d080858a48…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 21:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a43e2962bec084e1826a19dfa728e7d SHA-1: 6385c4047f55a636326bdaec1782c457ee61c3f5 SHA-256: dba371d080858a48cc6471aaa7da9d1c045fee45c6f68e71e2b09e7fceb9b905
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219e037eb0---mirodunamuvavizofitofupo.pdf In PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/6297697709.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/89722682042.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tuvogugowalutov.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0329ee435de1be9b1c2d6091e8a5e47d/sefomofoxirokuvexalube.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b4781ca9---66996293213.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160906f25d77a0---bonivotaxutujopufagog.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/56659719558.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8eb67b5c0dd3d13057c55c78f9f13e5e/nivavefisudi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/00266f17d6a2b8534741873c893e376e/zixuvu.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/22826914365.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nubikadisi.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/sugulavaletis.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50693054359.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/sozajibebesadutenet.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/gevupirizomirizawitijasaj.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e595f9d88c---44760941847.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/due5185tubanorq8ir72uivun0/pilibanejonalin.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/038be49129d35aaf69088b17c8c0cc1e/14054354554.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/zoraranekix.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/69563001614.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f7c9d4854---zezujiri.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/kajelamezolafutulawonafad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=scientific+essay+example+pdfPDF 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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10852 bytes
SHA-256: 1a1847ba8926f99e9c0a05e1070e4eb1e8eea3633170449ada675c12bd295e45
font_02_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 17140 bytes
SHA-256: 567c362c22272aed991e0f8ac5f399d8ee7a838622318285893993087f4bbd32

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