Malicious PDF — malware analysis report

Static analysis result for SHA-256 878ee1f1c089af0e…

MALICIOUS

PDF

88.5 KB Created: 2021-08-09 21:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7ea2c31dfef9be7bf1a93509b0e948da SHA-1: 2988095ce1cb569c853fa43531381ef497ac08f0 SHA-256: 878ee1f1c089af0eb791ece7dbb769ea66b36593f14a56d336a6d8bd2fc5fe64
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and disposable hosting domains. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://msslink.ru/userfiles/files/rigovudumi.pdf In PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/u0ti4rtpk6c6usb3qqfeetcu3a/650639933.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/47052782002.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1132e8bc2a2b2cb2ce7861ed822ee45c/bejisepezorutigunorigo.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070312040773499.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tl5htnjuukc29fe8gcoturpl5r/koxotezer.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0468efc39b478d16999b853cef22d433/47630055917.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c886749d40f---67225544124.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042905040569.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mogekafadefunuvit.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/wutaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089780192c52---gukuwowokujebubelab.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c081b576---bujobitetizexuja.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/futekizonizomibim.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/kadimutanoju.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/nukifefovugegapejiwiza.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ddd46ecadcc89af3e9a25ffc1bf0103b/fekadugoli.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/jemujexubikakegix.pdfIn PDF document text
    • https://birotex.rs/images/files/sizekifomururosej.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1f16ecc1608c2f4df74cab830442bc64/minubegunepuvonafipovi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/varumig.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/damotibexedezex.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/levadewutosiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nutritional+information+1+small+bananaPDF 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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10512 bytes
SHA-256: 44ce9b9d12dcb6642548835a807fa0b8835e2a1e616c3255a03b3df772aa75d3
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 17320 bytes
SHA-256: a13bddc5757044323f4d586907783b716b3c1fdee8ebe20af95874ee84d9c4eb

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