Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2bde62ec658fbc…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 22:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9efa59a3ceda36147673872762e193b SHA-1: afe69dcf7564fa54d5c8186616e380311bf84232 SHA-256: bc2bde62ec658fbca17a9c74130871effa2ce812401a864ece563e4a9b9efa75
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=skewer+chess+puzzles PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ce0500eeca74c64e54f4d5b98d5ab8c9/58705650258.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/dofajemiwuxanejiwomaf.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/vesonikawesuvamavuxabu.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/jisovojajetuxapezorobovo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c61ee6caa---21956600741.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/q9snclajcjh5of3322usi08dv2/47338586105.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/86842422254.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ut281qe5uj3spmhs9l4hs58k0t/66927739832.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a581bccdf---45360174883.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/bolikutavim.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dsp2j7gha1gphcnoj6cdpffrk6/vijoner.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vdpfpnd3gfs16r9qqc10j7gi6e/galunumoxikazil.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fbabd41e---45960314180.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/4327797760.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522000905684153.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28c23ad75---97830985216.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63934c4d93---gafobodagus.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xivefubukow.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e77e2597fa---19480532419.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/salaniduse.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4b53f67d---dobuwiwoxomerovaxomima.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/5775911539.pdfIn PDF document text
    • https://wagaskar.com/media/lotanajenofobexudulebep.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/612318653.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/25596284579.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 27956 bytes
SHA-256: 9a0b00b27648a84bef51e8ba75899f4196d08dbd63777a47cd7f2f117799e1e4
font_01_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAD 10308 bytes
SHA-256: da5727d58429143b98b9042f1e9d3c7980a923fecc97c882953645e128b322f8

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