Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf949e1aeb1f4554…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 00:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a96d6f76986dc937c43f8e1f556aaad6 SHA-1: 206ecd29233f1bea4bb6e646e052720d47120a97 SHA-256: bf949e1aeb1f45545369913a6ad9ffbb159522d43b3ad72bc2318d1399dc2803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and link distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=sultan+tamil+full+movie+online+watch+free PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d5qhpsjdbb8vc6f3osj27ai211/tanepazamexotelipat.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/niwamijinipuvapibes.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/retujuzulofuremiweter.pdfIn PDF document text
    • http://henca.com/files/details/file/24164621705.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/75589259724.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/66722863269.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/16530012830.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/32349092274.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/vapopevaromimulinoj.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/64838347284.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/pobizewaku.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/bopovoras.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bc54d279---80245565556.pdfIn PDF document text
    • http://ruihuitax.com/files/file/77578735498.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wodabobake.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139efc9426a1---52493972482.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/17/noralid.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/jerekafanurepixiv.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/98707770539.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/52526184797.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa4d7dfe2---xisaraselefitifovi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/46500022146.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5b761825---fezixadakoxuledodexejadi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/66749572174.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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 10760 bytes
SHA-256: b3bd93fdfc4645628bfed4b183cfef4d5200140a72073fa5f287bbd26eb58f54
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 18004 bytes
SHA-256: 6e07c00e08f5a3dfb2d7f0cb26e67faf013d24e1852d07d651d8894d0b0f85bb

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