Malicious PDF — malware analysis report

Static analysis result for SHA-256 286f5dc33f34a5a6…

MALICIOUS

PDF

93.9 KB Created: 2021-07-15 23:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b815cb95f04fcb0739f3c2fc9431025 SHA-1: 0c36e01cf6e7ad95e9e65bf1546dcaab323d100e SHA-256: 286f5dc33f34a5a67067a5f3d31189ebb392a52cb1983ee451c5f55886697fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress upload directories. The primary goal appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ecf41603d---630263941.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e3757cdd566e83271bc18c10feb7ad5c/sorunimebixusas.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/302edd8c9a009cefe07fd03e6b169071/seworuxumadesadakej.pdfIn PDF document text
    • https://activepymes.com/pub/file/19496331834.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/bopukufavozowaxuretipub.pdfIn PDF document text
    • http://tfforming.ru/d/files/64756656970.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/wavodezedezafemuk.pdfIn PDF document text
    • https://ms02bet.com/contents//files/74723998120.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/japogovutixixazo.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ttaa3hefnek0dfmd5tuaskvkb0/52199477232.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54a5a6419---63031655618.pdfIn PDF document text
    • http://psmpetcare.com/clients/76030/File/70307434847.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/a6c9a109fa7cc21a40fbe88b2771e86d/92758609812.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/70ea3da5c3a04fc382e510028ec8a29b/71757949420.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i78jdmoe447oldk1357h1opbht/xobizinoma.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8cc3d44ea09a8caf51d81ea09af4cde0/fezawezukurovidofufusigu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0588141905---suxolokujunurosidaf.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/jixomewoviwefaj.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/67641373576.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lq2g6c2kr92toekl5pfbnrpt91/46095206293.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/80380922351.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/rebefififadalupipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=commentary+on+isaiah+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 17212 bytes
SHA-256: 63f7d78d75bcb5e9df4db6bc1cf1e4a6584493b209e925446729a7d0ab4f0c1d
font_01_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 17464 bytes
SHA-256: 473d62892c753d4efebbbaaf03de48dd5accbd9417186f74c0ed3a76b2143343
font_02_sfnt_off000139d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EC 10644 bytes
SHA-256: 9eab3a97415a90bea56bc47cbd93e00aeada7aada072df9bf8a6b305a86e4552

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