Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca1605555b25ef0…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 09:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 90e6b4dcf218972e33fbc73c389321ca SHA-1: 7dcff32c474469630544275a6d65d989e79dfb0b SHA-256: 0ca1605555b25ef0273dd13aad27ac088dd986e92a7493bc4b7ea1b0bbed0675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=how+to+get+mods+for+star+wars+battlefront+2 PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161457d32ceeb1---33093479918.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/goputobonobug.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/85711351658.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16151417031dc6---67163932854.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/milaret.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ea9c6756---56847222142.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/medifizezigubejajip.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/41044648990.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb6f496de9---92411140632.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/razasazelidovudu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/8689064223.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/mopajes.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/76001447731.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/tuxoneguzewusunofuxep.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/vukufe.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/32742364526.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/kujojijakifosijaju.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/49130516285.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/84205441939.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/68523184437.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/tepekubinir.pdfIn PDF document text
    • https://mama-light.org/business_school/uploads/file/77429027113.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/17742846789.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/rapopaboxapa.pdfIn PDF document text
    • http://biosite.ru/images/news/file/56475849364.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/94404321721.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/81110701024.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_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 19188 bytes
SHA-256: 7b5b4b247b35aba372230f9d3a991c59d8bc4bd42d208c4a8450f13008e422b2
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10944 bytes
SHA-256: 668fd2bc65f0bc3471c519b04faa50a6542f15869a23fc807d620475d3da0c1e
font_02_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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