Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ffb8fb869c4b83…

MALICIOUS

PDF

78.9 KB Created: 2021-08-04 20:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80835440a97d881d274cae17a20051d3 SHA-1: 5fb733e94547b1721d374146046f5fc4b5a70b19 SHA-256: 32ffb8fb869c4b83ee6c430167a73fa05ad3520cef111cfa6840f0e653a7720f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to external, potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5be774454449a2ed4cdb7b4bc05ef819/gezinarajeleboluje.pdf In PDF document text
    • http://campbellelectronics.com/uploads/97480215233.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/61712107058.pdfIn PDF document text
    • http://absigorta.com/E/file/3094625882.pdfIn PDF document text
    • http://dzbnf.com/upload/file///50140034122.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0kdumghgf71mud9i2siooe6d7r/suxalazi.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/26114666285.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/40962013538.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/21363326440.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75362e2dc---guwuvuwopaxasizagim.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/92446242969.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9534f343---liwewedijodibibewo.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/64951381020.pdfIn PDF document text
    • http://billsky.ee/files/file/zologavulonaguwepufuva.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/15685498115.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/11938276452.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/totewobaxipu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081822a3a3ab---pumuwefiwomupatanifiwo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de8c21d27a6---nifonexabanijab.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nnhj279qnsikcivq1gdfhp2btn/87432181178.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/94143378039.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/13647346926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=human+figure+drawing+test+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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 10852 bytes
SHA-256: bcb5bfcd3a23d4156303a23ce4c9255d8639f0f602c02380a822ce1a8f99ec97
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16756 bytes
SHA-256: 092e6e37af624f79ddaf2dd867755f5dfbf4d580aac503791cb442eaf3157a3a

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