Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99506ccbad7f8c…

MALICIOUS

PDF

112.6 KB Created: 2021-07-04 16:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a4bb804397c03d58345ecba4112ff15e SHA-1: 25d53a2c2997ac76008c31162ef7c6829a119408 SHA-256: 4d99506ccbad7f8c4067888d8b563caa45dec59b72fdafcee4524b6064f0a456
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcba47c07---23872042088.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/o53ier9fas9i5f64jt1of2jvbr/45082393407.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/dugusakowon.pdfIn PDF document text
    • https://yuss.it/file/15674875347.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cae8bc94b6f---86225368251.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4bpn0cch672vjf525tu2l8i0eb/58474441529.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075517a74a99---10621438632.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c27d0c7f434560db12fe729c3b4b578a/45699377719.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/ligexavu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qr6f8ak0ca65vs9pftts6afp42/sanuwura.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/gijubawelesolug.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be667d591b---bugovafivutuwawawiputiro.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/7a6e616a5cb38a7d3495988a1a883f78/kixezutam.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/tekasi.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/guwowodumor.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b81fb537e5c---tibaloxerakize.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/m65ar3c2lanjka4phd10sg6gh5/63651254485.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/68639087993.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/27417760379.pdfIn PDF document text
    • https://fishboat.hr/files/bofukivumixozilev.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ilaqjrb69ujtato4jko53fr27/28172903047.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160833cc30f83a---7986041186.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/7013523569.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d944360f00---87405979732.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/cb2160b3ed7131b4ef410d1ed98017c6/30456825689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dealing+with+procrastinationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D74 16768 bytes
SHA-256: acebfcf2748e5ef12dfe90bc626e66e7c6c5e79c729e36fba4ad0a371daeae34
font_01_sfnt_off00015559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15559 10740 bytes
SHA-256: 5161ef96905636b7d6456815b52cf19f1b890806f37e340b04091964ca5ea573
font_02_sfnt_off00016dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DFF 17844 bytes
SHA-256: 96d0abdebc62ded98387e9120f671055f98740bb7767bd1d76a4e7d5edf8646b
font_03_sfnt_off00019c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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