Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b837f8e96a91c0…

MALICIOUS

PDF

90.4 KB Created: 2021-08-29 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3b2a05a4f48005e7e5d1e5342e4e2ed SHA-1: 87dbef002a82fa9e1a7a67e17435f1d529c35dcc SHA-256: 69b837f8e96a91c0c8df2020b18c81a8faf49a9de8df5d10fbfc1ff5c82856ea
196 Risk Score

Malware Insights

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

This PDF document exhibits a high-confidence malicious classification, primarily due to its role as a payment redirection lure. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://hocikto.info/userfiles/file/goroli.pdf In PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/wuvezalozavorivuz.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/32104457478.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pujqds7qgbdcehpsvgo3qomifr/vogedokenibomimulu.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/26448278639.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16116a0ba2fcf1---33129582221.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55cdce027---49748171384.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/50212207559.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/779775591e0d0b8dbac0235cebd21aa5/21795646385.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93nq3i1e0d0pmhlc8gbg1cgp4o/nogedulabebijofelalituli.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0c9e8920a34f9784c8af2db1cc87fbb9/12611430105.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/wikusik.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/22137804787.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/todufupuxotusoxegiwurex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16093b222d6c70---vudubemowewevopurorod.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/virawegusido.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/99235872349.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3eae8ae7---92913084013.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/54235874524.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/wubonebexigegimajelakumu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cd053d43---61013102135.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882b7fdfbe4---55866248802.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5efdf49f---gixaxilaminiz.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/sezalatuk.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nidnnv24c6sjg9s5ip4250hvdq/xeteneturuvumuvodofazup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cost+accounting+14th+edition+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_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 18380 bytes
SHA-256: d65912eb4f63950efd4ae0f17bc9ea772071999f0683532136980c56e45f8248
font_01_sfnt_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 11012 bytes
SHA-256: 1ca6b8d603f8e3b59c54cdf8270454ecec1106fc451f42768c1c3f51af3ece28
font_02_sfnt_off0001424f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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