Malicious PDF — malware analysis report

Static analysis result for SHA-256 2787a764ecf55a72…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 00:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4014652e5b2c3b5c6ce661fcd7bc20e8 SHA-1: ae3b07dc0f8ff53c130d048088164c688e4d2f69 SHA-256: 2787a764ecf55a72e346e4467003c0f6a2ff145242cbc38a27f6dd916c6c2af5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. While no scripts were extracted, the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://esistore.be/userfiles/file/80978143165.pdf In PDF document text
    • http://gayaarchi.com/userfiles/file/20210812135839.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/79466024637.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071045b99c35---31301748108.pdfIn PDF document text
    • https://panama4d.com/contents//files/rizisapigefodizebe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m7sqhp20sbkujh29fvr3qpngv7/nanogovig.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/gimugudix.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/38620458280.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072897d124ae---kujiweb.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbda83c5c83---wofabokabitajir.pdfIn PDF document text
    • http://nensi.si/upload/file/toliliduxetem.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048e77d467---xebufetef.pdfIn PDF document text
    • http://evola.it/userfiles/files/ragujanomivejafazogivut.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/nanuletepakajanedalasona.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6949fd8915---jirukogowezazorazomike.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cl3sd70dkbj5a183tldda237gs/ranojazomaweturaxenowudun.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/xutigutusomipikupoleve.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/gudexe.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/jigor.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e78cadab206da1113a076418e842a4e9/sijoviraborev.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kitodajif.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/94667675048.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3b59529054f51d1bd0edd1e6f00cb437/futibotagetixures.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/eka5ql39ue1451koe1g78du8i2/gikawowifis.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/13107418249.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/divenasaxozipawumejenekum.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/86466330596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ready+for+first+answer+key+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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 10780 bytes
SHA-256: cda40094e833c5890e9ba0b627cd09d37d1c22986f30caa174dc91c24c96195f
font_02_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 17480 bytes
SHA-256: c7a24b36000e6c693e266e0a960e96d596754d88b6bb7aff21fc2220811d7822

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