Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e891f8848a313f…

MALICIOUS

PDF

89.3 KB Created: 2021-08-18 15:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0efe8173c8e8602901f4aadbf88e0b8f SHA-1: aabb5ea22ddf7dda3cc66e916d9bae5dcbeb5d5b SHA-256: 38e891f8848a313f5ddb8e83050326e68ded26bf15a7c693d99ff82f2ec94c21
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive means, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yngc.ru/admin/ckfinder/userfiles/files/19698394684.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bcb14c52---basizopufupi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210816_61BF58A4A878B2C6.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/xiluved.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/13034613343.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazaxobufilebedibonoboxuj.pdfIn PDF document text
    • http://landia-print.com/pdir/file/81456493778.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/71106805407.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be2c7b2e7---79643848265.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/51423261450.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/21010535056.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210716044539.pdfIn PDF document text
    • https://cape-electronics.com/media/file/17201718475.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/278235f054eb30e234af7554679d4f28/kefakeri.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9r2elg2stk4o3emrpplque0sn4/nabaxitexemifosi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/19760079009.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/6513251658.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/40536185630.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecc17eef5---88528518844.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/62494905458.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/43080689017.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/fiziximan.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/dovodosofupodo.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/79850704311.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a3742e4e68e81bd65cf38908df6bd301/22820852353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=take+off+flight+simulator+mod+apk+latest+versionPDF 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_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16644 bytes
SHA-256: d705590ea5ecce25d250da1b1b7eb80a5524c5c75d65e99a5292bcbf7f30174b
font_02_sfnt_off00013cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 11164 bytes
SHA-256: c88877ab970ce5d1596940efe5794d8bb85a72f5f12aeb7c33e453f408a3087d

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