Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f087dcea72727c…

MALICIOUS

PDF

95.7 KB Created: 2021-09-15 09:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 998e5465a2b84019992470895b66558b SHA-1: 9759106bcc9a4a582ea488f6ca37a34a270d1f02 SHA-256: e0f087dcea72727c6ddba20bfe6a6da195c555058f6bced0073668aa8c91a0e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://edituj.cz/res/file/84576945234.pdf In PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rujakej.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88e0fc89dda789865fe0697c4407dcbb/lokekuzajoxuko.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/15092622141.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/pozagixekurikovogunabokoz.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/nixifabubumofenurivob.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orovew.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/famusivupukid.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec68395d04---39713848738.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9775fa20---gusazawibabipunenipikozo.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/vesidudunefowo.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/rotojulemosisezo.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zeduv.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/39919020508.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/xoferosafe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e5f3635---kevoneg.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/85717056403.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/99011354294.pdfIn PDF document text
    • http://bubb.cn/up_file/file/69815805524.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/41347409003.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4087b4870---mokupe.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xowevamiluvoxix.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614052bd7a790---1999676125.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fujorijinixuk.pdfIn PDF document text
    • http://medi-sen.com/files/files/94492326338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ps+lightroom+apkPDF 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_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 10556 bytes
SHA-256: 03d20cf604dd0f402709c9137cd76cb95ea39c34d01477351db2f6335d0da62b
font_02_sfnt_off00013fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCB 19020 bytes
SHA-256: 55e12308b77fdf623c35dfa07242a1bd69e8688a2b5dd101e635bec870c53419

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