Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f09a51b3540d28d…

MALICIOUS

PDF

88.8 KB Created: 2021-07-28 09:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d8ee8849d922728722ddb4fa01f57dc SHA-1: 242329ad54c9e1a2e1e6339962509933a43a70cf SHA-256: 6f09a51b3540d28dd2b437cb52d28495a8d7cd4047cbc6ac5de8f81e6f3dcb43
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm strategy likely used for SEO poisoning to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, with the URLs likely serving as a distribution point for further payloads or phishing content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1889f0b941---ruxapipawojolesim.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d06e516195a---papidisusigogavexomalut.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/rananomuno.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/73892379072.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609661e48db11---25840497384.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/ziveresakulajisefinar.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jugotepunisusosefomuwodab.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/xukij.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4e196695784c9a77f8cc93b0efea96a8/88480732281.pdfIn PDF document text
    • https://birotex.rs/images/files/33342730830.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/navozujeja.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ic7vcfd389906o0po9b3elu2o4/boragulu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ib8nr96pi5buu1l30cegc784m5/25976579849.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa54618ce6---64152581790.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/momupano.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607515c9a369c---59915081377.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9932e3ecb---rukepetudodogona.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f25414b8c4b86f73180bb127168afddb/fivoviruginaketap.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c57b9093925be54fedcba1ec5153772f/50934109325.pdfIn PDF document text
    • http://hodori247.com/uploads/files/pexolenotases.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/8317134649.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/d5vmi0pfb2vigckpr2okctdiof/tatagupeve.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1efd6747c---tigunipagajox.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d323fc4578323448f066199bbfbea6e9/24214819990.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ce393cbeafa2baf65e9057091785017/76845268274.pdfIn PDF document text
    • http://arslanemlak.com/E/file/71894642717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=descargar+musica+de+rigo+tovar+gratisPDF 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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 18892 bytes
SHA-256: 17ea2913669496c3a8a3a8de06cb0283c17ebb7f0f430779e0eb3640ed42e31c
font_01_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10732 bytes
SHA-256: 2a780ab0b7f65fb70d9fa252ccb0b99f156c703107b784b523a687331fd4e6a0
font_02_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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