Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd4541d4d2b5fdd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 00:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 984841302e48499e21c1790b1385543e SHA-1: 2b3fddc61de1c4b9991011a4e8448b9d5995ad78 SHA-256: 2fd4541d4d2b5fdd4dde9a06a13384b0d6477370454a9b4596ffaec289fd8b94
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm designed for SEO manipulation, likely to host malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=how+to+hard+reset+phone+using+pc PDF link annotation
    • http://hyunbulsa.org/~ewedd2/userfiles/file/88819502081.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/67230390067.pdfIn PDF document text
    • https://alpinashop.bg/files/sajozez.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/wiferodude.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/lozijotulipegeramodawor.pdfIn PDF document text
    • http://dezis.ru/uploads/files/pexefiludabemozujabe.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/wifumesezegofu.pdfIn PDF document text
    • http://debten.net/UserFiles/File/zekepuxiziwubamixit.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bfikcjmn8isqsbmmoplq93li08/kabegosevilof.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/35074909293.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/10698972649.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc099586f3---fovakeriravovo.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/damitotefulogir.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/41526422880.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109112032558576.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/54606246278.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/viboxomasolagik.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8d5bf577b84426a83f32a177e10d8221/wevawapip.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32861171233.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/vizijeponisorupevudirid.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/17215637694.pdfIn PDF document text
    • 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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 18120 bytes
SHA-256: 532d9b9cc33a282edb8ddf7009422097b2e0555d42f5dfc3bf1a9dc0692ebb04
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10924 bytes
SHA-256: 9409fbb9174dedad77fb8f5a05512eb1b4d479c0672201b16727b4e8664ffa73