Malicious PDF — malware analysis report

Static analysis result for SHA-256 b592e484f51ae567…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 15:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bcd134e633927cfe2df83b7ad2a9ee3 SHA-1: 11862fc644cdb8b6ad65702f7019777f9f0add42 SHA-256: b592e484f51ae5675557960787fd328f2059c229741b3f0cc3839a45335b9162
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9fdbeb18b07b90aa0b0d0cc41dc7ca2a/87587616160.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/54194530979.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/jegejitamifem.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e2703f1471762e60f1d5e422ec8161ac/59071712899.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/72925937956.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160babc82a0701---53218724479.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/24539991769.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd949ea96---35711580641.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/zasabuwigukeju.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/getaribuzumaxononoveko.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe8f1f48e---92212793370.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/868eec34e58f34aaad65de237ddc40c9/84008470511.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c745cb8e975bec4068585a60f5abec49/91200539775.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/4634451768.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bb6383f0e447670436db1933dc7dca99/49578740525.pdfIn PDF document text
    • http://vanhacollection.com/images/files/padivuxupowawi.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/70423621146.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/tovesegorozafifemuvu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pff0la2ttf7lejjobklp10ombb/bikigexejejefawi.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/pafejaruwewimomika.pdfIn PDF document text
    • https://icbacademy.com/upload/files/20600298072.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1dc51ed8600f97a75a83d119f3abae30/xularovibezewivanufunano.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b5819b292a20a8954c2c4457540832c/xuxerumixirajaxar.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/66401653767.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/387184448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=history+of+video+games+book+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_off0000c3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E8 11092 bytes
SHA-256: 8fe6c99685c0e2dc54bdd74c40d5b01cd6fd21f3d7e7c753c84ebe6c30008481
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 16984 bytes
SHA-256: e60cdfe1ff0814ce4df4dabfeac14f70530039df7e18842dc6fc17ffc78f306d
font_02_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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