Malicious PDF — malware analysis report

Static analysis result for SHA-256 59be4b9b5e7bad28…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 16:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 639a9fbd57619680b98152b44971490b SHA-1: 89f0960783b9c0943c7ffa167a6953817fc05a43 SHA-256: 59be4b9b5e7bad28fc7b7f680c568971beb7b32d294a27afa529448c30d9c341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://catamma.ru/uplcv?utm_term=top+10+sweaty+fortnite+skins PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0d45aac85288676a755bfba16f14a61b/46616589056.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210920_665CD6A8690A5DA7.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/guwipodemakalofasod.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bbd3571cd---lagewuwosisefudolofebolu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/70760620158.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/38492116606.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/29081912438.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/84551510698.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/41685017678.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/66062328130.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109181809583364.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/75675236538.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/68741797542.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/xarovubedenomuzotese.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/af5c1ef6d4a23db2687fe6793c888fef/bajejebosovaferidopunopu.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/wukivamigemujoralakusovul.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/fonap.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8b927b3d---50930324090.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/399bcbbfbce39d293c9494c11da11bce/xokovavel.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/7379948820.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/mozizuxetolazalonavif.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/powojofimapeguw.pdfIn PDF document text
    • http://vodnik48.ru/content/file/woxoj.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/79052962803.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/65413029763.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6jq7sb805kn723dbhqi85fudfl/xabofebarigokomavezisat.pdfIn PDF document text
    • http://355353.ru/userfiles/file/metizeguze.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10736 bytes
SHA-256: da70c24b0593918f6ab2deb6a58d869076b7d7c569fc709bcb033eb800e536cf
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 17196 bytes
SHA-256: 605776ed91785f17c189d894b4a10f68d765e6091d770c6b66351330252eb638

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