Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b075db3049bf36a…

MALICIOUS

PDF

93.0 KB Created: 2021-07-08 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 715ce060a0ac7bf09df5ef053207a0e1 SHA-1: 1ff8902bb8da76c3c3f8e1f99d4103706e995995 SHA-256: 7b075db3049bf36a956e7180c0ad7b720df6b232a8a27edd8def70118c0e2265
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, with numerous URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve as lures for phishing or to distribute further malware.

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ebc7bb4d---76587028717.pdf In PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/40857443467.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5b8322befd244c99600ce409963db0a4/4922931048.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/23809071793.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/wulugitewupinaluxoveb.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/3499384101.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/avrf241ouj5n8nvvcsagmgovqh/75373889046.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771f4eeb3a2---sowotovamedalobejuzadosas.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/35720111461.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/11045104921.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106250911211061.pdfIn PDF document text
    • http://adria-ex.com/32390230203.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/58449350053.pdfIn PDF document text
    • http://qa-whg.net/upload/files/50347620359.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/31315597521.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3b928952---14340393781.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54c6a4ad9---mosafifeduwinurekilukure.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c2215af3622f4671103ca0e25af927bf/gunopibipaguleliwalole.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/204c6eb7b254b842d9083c752e67f0cf/tonisekivolenew.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///xanejanejinoxajugenoxot.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/18957773121.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5185bdaa0---20503924486.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722626066b3---vuxebegekeziwetezavemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+fundamental+duties+of+a+citizen+includePDF 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_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 10764 bytes
SHA-256: 8596b78ac5b91eb5a529d5234fb5f1372de8186ac0dfd2c6e5672fcf61e09f64
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 17944 bytes
SHA-256: 68b9a16087445706b1cb7ab3f4cdcd6206788e134d62c120b045dcd1aa6c8302
font_02_sfnt_off00014e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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