Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58796110d670f48…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 12:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d9afac1c2281bb366f5a578ea4580c0 SHA-1: b7fba8f98126e6980fcadeb25abcf615b88880d4 SHA-256: c58796110d670f48d2ef6666ed11a0d949ea2d193dd7caa3aeb9a7114e2d6553
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, with numerous external URIs hosted on potentially compromised or disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=horizontal+and+vertical+axis+wind+mills PDF link annotation
    • http://saraya-shop.ru/upload/files/fetudotefewajutadem.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/60961604532.pdfIn PDF document text
    • http://chineseclothingonline.net/File/41930294477.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/darubuk.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161326525cc3ce---14709663691.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/36429014892.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/58e9359e692207a13a6a9621276aa881/62719005166.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/vetugeli.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/botabonutivulot.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/10061830320.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613261d46424b---53406202620.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bf26a8d8---vagusexivenotet.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/tosazetamoxas.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/mifop.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905190155.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/57426287813.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3e0bf229---88028304594.pdfIn PDF document text
    • https://securitydm.net/slicice/file/zubujetarijixenas.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vilexelajeledegujekusut.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/np53iaceitpr3k96209pc9gk3p/tolominerurowimilelilegiz.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/87114575211.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/lofebixajanov.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d0fdc51b---jisokojowipavujosozu.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/dapogekoxafu.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 10836 bytes
SHA-256: ea8185f66fa1d498d364df0dc0302e05729356da1f50d1aa3da1a97c49d79d34
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 21236 bytes
SHA-256: 6ac55862eef4de2f11f4b7c0d8c4b49f8fd0c56abfd1393cab915d81760c5baa
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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