Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1793f93d6dbe43…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 00:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f405cd115b618689d25cbcf9be5a53d9 SHA-1: 46f5396e1b2d498dc9641bb673bf7599fc4524fd SHA-256: 5f1793f93d6dbe43e2eec56c93a07b2ba9259dc392778502fece7f610c9c48f9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this file.

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7c7830c5413bf494b8295cdbd32f327e/xarasunojosudi.pdf In PDF document text
    • http://alrabbancapital.com/file/files/tutumukemowedogufuliw.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22436010118.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h1onrrg7jnlbcd0kts0k35q7m6/73234362489.pdfIn PDF document text
    • http://www.toptehnik.si/images/4015297824.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef171f61d---20595193334.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/xujikatetipigoguku.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ac3a209f5730390aa875333b0933bf11/9720782509.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f82f48625df8a17ce9a7ba5b7c518545/zipapagajevirobetuki.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/pulufinawozizovuwakir.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b601670252---fulefajoliwifete.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d2968b9a911a9441363f8e27e81b92ce/70804254206.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e0924a20---72172341102.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/wufexezorotiw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e03ccf9b0f884c4b4430f306b6afb4b/gotewixesorogewulu.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/titebigupef.pdfIn PDF document text
    • http://wajl.net/img/file/2021621194252.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8edf9de26ac3fbd5f5a259a26fab0ac/ruxewupixereteto.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6c3b1e979a4df5996e00e3f9fdb22a38/41429822523.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf503c393e---tutozuwebovunuwerulag.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sijezalasunikodetebudum.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/povamufeno.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8bae4fc3---viwoxukaw.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dufazisiwona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=audre+lorde+intersectional+feminismPDF 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_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 17852 bytes
SHA-256: c070f395a0d4852b0e1846f4ce764770272cd512dad65892295b3598c579fcc7
font_01_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 10716 bytes
SHA-256: d5a2b448e5ef0c76fc01e1265269585ba3f92b3847e4acf24b6b299155b94b69