Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa66dc247ecc7bf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 17:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 675568c9fcd5f0f5216920de3a583859 SHA-1: 8c2d1213d4fa1aa14d662f444d4fa05457c9e203 SHA-256: 3aa66dc247ecc7bfe7f6ea13df8c526705e807e110b4cfadd22562d05d1b0ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or engage in SEO manipulation. The presence of embedded URLs and the nature of the detected heuristics indicate an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tonerihned.cz/userfiles/file/97682221058.pdf In PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/8551205542.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/86768293552.pdfIn PDF document text
    • https://pepsima.biz/files/file/galerosojulepaxugepejen.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3720ab6f0c9c6aed22ab3136444073d/vofuxomaxap.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/zodoxalizav.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/5591324649.pdfIn PDF document text
    • https://miet.hu/kepek/nepegapavuximadeje.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/88752011862.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/98373016335.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/peladenabolomidobowutetu.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/werilivupomimomowukod.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xakav.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kafagerinewelusaroduzij.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/042025be6aa1dfe3be6ab79ff75358d2/xefodejewivefozidafopu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f754116f---xujajowerosoleku.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/74596641699.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/repogatukilupalapowe.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/48191123557.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210906050402820.pdfIn PDF document text
    • https://songhong.info/userfiles/file/gubomasukimoxokefarikupot.pdfIn PDF document text
    • http://p-energo.ru/content/file/87000382945.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/megegikewa.pdfIn PDF document text
    • http://hydrem.ru/images/file/divibuzokomubij.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/88188081636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=patanjali+yoga+sutras+in+telugu+pdfPDF 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_off0000b60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60D 11016 bytes
SHA-256: a8e7cd8a44fa8fc2f3124fa13f6c2b5e65baf89e29841a9c1cf7fe814dc93354
font_01_sfnt_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 16260 bytes
SHA-256: 71f7efe1b076181cce178c2575c60c24f7dd7a21e6e25f23337ad0a2c2551bce
font_02_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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