Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cb3ec6935307f3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 19:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4410e9e034b0b0b7fcd77fc51f35f21e SHA-1: 80d7d6dfe3208d55cd9cc29c6c792360fe7f0294 SHA-256: 53cb3ec6935307f3fca7b37c68a4f55b8e95ad41e6937e2fc24ddc82a448343a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to lure victims into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=word+family+worksheets+pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607657228c0eb---35289852265.pdf
    • http://currycornersugarland.com/admin/images/file/wimifusafejikalejobogil.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a226aeb42d---jetulofupetinirazevuwo.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a990dd2955---jozewaxeg.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a758ab75db2---kevekez.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1c1cff613ff15e8df76a2136bd4db728/zegimomigodibopil.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d1c7a471---53825577999.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c66f11359ca3bce2fbb9d3be7a95fa6a/bupuluni.pdf
    • https://ceccargiurgiu.ro/userfiles/file/29096535989.pdf
    • http://smartwealthhk.com/userfiles/93038449509.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2893100db---vumebepekakobevedi.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/51717608260.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/43923201015.pdf
    • http://royalrep.com/userfiles/files/sibinoz.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4901434c---xavaligagupemikasapebufar.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8c20fd4b---48934024878.pdf
    • https://actor-conseil.com/files/file/badirexowikasilijejiru.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ada937e1e58247b3a0be598d6663d211/gulifopebefibixisugodinib.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e321aac695c---33654440135.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093acf3d3200---19975860969.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe7f323fd---38870227728.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/eais1fien06n668c0kek18b00s/xuxalosusabo.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0gb0dko1lkd3oanu9c1fntc66a/bozotinubavagifokakuv.pdf
    • https://diarch.in/WYSIWYGImage/file/23309672296.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be44b827e---28509965894.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b40a.bin
73456ff9aa1a3818a5a1bdcd3f8d90d0169601457fdf9e7372c53b1e366b4807		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 10944 bytes
font_01_sfnt_off0000cd71.bin
6c76b8a8429fedc1826bf71da76cb4a9e3063144639019b43ec3e21af5960ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 14940 bytes
font_02_sfnt_off0000f35d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16792 bytes

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