Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd235a15d7983097…

MALICIOUS

PDF

98.5 KB Created: 2021-09-06 10:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9deb8dcccee64158d39576e7f876c220 SHA-1: 08c12561d420285470c2ce3e13e19fe7b4dc859d SHA-256: fd235a15d79830972b2c16e480027f71262eb8be17a770360e426ab504157811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the presence of link farms pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde5095f51a---82551703164.pdf In PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/76453244034.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/detuluragozejewivodowek.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3f654eaaa361dc4e060a1d25cc52d2a9/mibopatiribu.pdfIn PDF document text
    • https://luminex.pl/upload/file/61157023354.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dda797660c9---23316693232.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094da254dc38---59607418984.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sawigod.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///konusugixidorekilakuz.pdfIn PDF document text
    • https://medtek.vn/storage/file/vobomojogabuwafosoxedal.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/59336721791.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/88f9e37500ef5fcd78f017fe63bbbfb5/perevofafumipofalam.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/bijepuvemurowamaruxi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed88a0e767---52630969691.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a07474841---6789205863.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9dd114437---63551685314.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/71532325210.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/wipazoxipagewipu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8659c34ad7---zekujanu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/446f7878b70db84858a58435c1df55cb/98396566249.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d7f412e95123fe0e16ba8d16c5538671/69009616006.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84211de30e---4365561482.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072600150973499.pdfIn PDF document text
    • http://debten.net/UserFiles/File/52514645200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=robin+sharma+quotes+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_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 18348 bytes
SHA-256: 4f2e572b2c73ee671312626dd24cc9d385ebfec7f38d979f4cfb7cda28b050ed
font_01_sfnt_off00014b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1E 11148 bytes
SHA-256: 121c0500afa50b0b95868fd44c9dd11c1edd8bfdd89d498111e92370fad3956f
font_02_sfnt_off00016494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1