Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f8432026b2cb91…

MALICIOUS

PDF

92.9 KB Created: 2021-07-20 13:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43009c8383777b3144c5ad9eef32b028 SHA-1: 2fd72fb59de25f854c7e0dca7cb0e4e1031c9dbf SHA-256: 50f8432026b2cb91dd3203c48ca14ef70a5eeb7411716cbb066a8872ca0ed97b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous domains, many of which are either compromised or hosted on disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cdkkck.com/uploadfile/file/20210608090516.pdf In PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b346891b33---wofumapiwukimetuvanax.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a91f75021---43000120876.pdfIn PDF document text
    • http://yoron.net/up/files/nepimedimake.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c335ac39d---28063086657.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/52901165270.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vujelapetevaxafawiza.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/fubafodexosanukapoli.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/60841336263.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d9621d71---naxofakutolexokupej.pdfIn PDF document text
    • http://jcpingie.be/public/files/51722300626.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b8a66eff1cc1bb92856ecb13eca23522/mabojidanepefavi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e9356434---nimupuk.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/66846964326.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20856a38d235e187dcda83ada39430b4/82229701330.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/mogor.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5fd678d5---vudotokozigememubawezized.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607249929c1e3---najojiwigujume.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/28441321061.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/medemozokivudixaju.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/80844396899.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c771b29d880---vijavulizilin.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/mikusowakitedidimu.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/riwukitarazoxutavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+penny+for+your+thoughts+idiomPDF 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_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 17604 bytes
SHA-256: 18c3f7afde100f056018e9e3496f0cb43a109b9213216aa2286b1ef0f395d635
font_01_sfnt_off00013512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D29 10932 bytes
SHA-256: 3ddd64a43b88c83dda0f7d76e168721998fa4e11d311157d3f032efe2655ae95

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