Malicious PDF — malware analysis report

Static analysis result for SHA-256 926d30d1133e8e15…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 05:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5268fd36a78de3635f43a16381187cd7 SHA-1: be4c09e6249355f83071984b1aa366c754bd4e9f SHA-256: 926d30d1133e8e152dcd3c66e90fcab832091a2de67bc7f948f1872d40b201af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=dragon+ball+z+season+9+episode+7 PDF link annotation
    • https://kontiko.com/ktkweb3/images/upload/files/koxabanepasebezegobimu.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raregogisubat.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/51795034452.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091315003373499.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133281050078---92129796480.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/67387842529.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/18692052002.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/55989502523.pdfIn PDF document text
    • http://naviway.su/upload/files/lurezibosuzaf.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/garirorazagudutuf.pdfIn PDF document text
    • https://ijp2.com/contents/files/90327121583.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/penudoveve.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053bbd465f---rapexunonuriwoxolunizu.pdfIn PDF document text
    • http://mopron.ru/upload/files/vawetekalagegitogurozewi.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210903092249.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/14565864389.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/50256467955.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/562096272.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/71954922011.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/devugipumaxurejup.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc554f10bb---dagimokopotales.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914095204646.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fab96780---10987415580.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/14770144393.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/27005879511.pdfIn PDF document text
    • 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_off0000c4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 17108 bytes
SHA-256: 116f3fc45c61cb48a2c9386b1d16eb3be32b106044149f48c384651da33e883d
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 10888 bytes
SHA-256: 6a85671e985973518f36778c2c113266d72b83799c648ad22afe727d7b35bfc7

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