Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b61a17d27dcf95…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 11:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ea0a2f8c7af6b20d03afa4968defb1d SHA-1: c7a44b81008b02a4f3e469331cdfadd7fbc73eb4 SHA-256: 88b61a17d27dcf95a948e83352b711332a2cff9e72d018a4369a2079b9292ddb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristics and URLs confirm a pattern of hosting malicious content on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404561c0e82---46770967374.pdf In PDF document text
    • http://www.cottagegrad.ru/files/file/40386360620.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/kurenuwikumejixok.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0ahivhu6n199e417cbk9t7fiut/43390297231.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/lizetot.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/gupunifudisa.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vobaxudomebud.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/31345983009.pdfIn PDF document text
    • http://saktigroup.in/uploads/51955066381.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/mifuxodamowobexodibapuzoj.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/movimadane.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/29151855194.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210922_0EC312192C29E568.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/1870346676.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/86270085853.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/puvavaf.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091602501073499.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ac48b7f1---59742531465.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vrihv6cudgf25rvmo2doaame0q/ziruguwobazudukokiwusoxiw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ebc8faee6f6f5980506161e6103f41e9/8238675254.pdfIn PDF document text
    • http://gysanya.com/upload/file/210917215405639623hvt5xotyk2bv.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca364c5de---duwujapiwawoluwafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ds+emulator+fast+forwardPDF 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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 10504 bytes
SHA-256: 071f2dea3db5e3521e3f924a30dacaf6e1eb9d266dca94461fade7adb2e16669
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 18896 bytes
SHA-256: b3841975d6d32d5a27ba855232a7f35216d366a6d3ecdb58d61c7ee65617d085
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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