Malicious PDF — malware analysis report

Static analysis result for SHA-256 13263cf574ef0081…

MALICIOUS

PDF

92.0 KB Created: 2021-07-09 18:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5cbb271f72b7bf8b3359c32a1014776e SHA-1: 460c6cb820d307aa2c70738ba46d3927e55fe3d2 SHA-256: 13263cf574ef0081d946e4f00cbc7744ca059cc6b0589cf5a4f7057d18eec1dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, several of which are hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://socohoteldanang.com/uploads/image/files/waremikanozofepipin.pdf In PDF document text
    • http://www.gesas.it/media/mailinglist/file/12826066747.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/aseokbrr49vb5be3o38tg6o8i0/wubagiluvotivobon.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9c0523db2cee7dfc42513d1ce83fbab5/fumakoxalugat.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/67d9502718624a62b7998bfa82f9a64e/80384254021.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0afb843c---20401791223.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aced18d0f4717af16d981c14b0f7f8fa/fidolazuditikesapurilosip.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/bopirosero.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4861576b88---19157088918.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b1c75ad3---teraxokar.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9346a113e---velodojafepafu.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/27ee2e36d9c6d768a07a09fbfe6d93c4/kezonusubewe.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c559bae717e---xusuxiwagedowosizi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/ranajisonituxubefipefi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc626789f---62620010242.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06e3831e92aee16eea75a7b620d942c6/ganeku.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3201fe25945d3976f0a00a84d33a7035/porisalil.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/fomudanosubifodiridivikak.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p9erflpbdutddfolsdas05f445/mutubipabibuduxul.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/17234fe12152e2403634e6776b4f6380/96031004740.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bhul4s0trq3lv6c660hc68v462/wulomutuxoza.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/97577686883.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa9b1bc8e---tugoniwepifelumamex.pdfIn PDF document text
    • https://uangraja.com/contents//files/kafowokerixojolizuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bloons+td+5+online+freePDF 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_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 18492 bytes
SHA-256: 49e7e43c408f3d006fed7ad3e5f3cc17312d85ca4629f1505880d5e7e9a71147
font_01_sfnt_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5B 10372 bytes
SHA-256: c251656c4a0345ac4a9d3b1aa4b5bd25ead2900a476479334c93f94bda11530f

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