Malicious PDF — malware analysis report

Static analysis result for SHA-256 9489293b3d773fd9…

MALICIOUS

PDF

83.4 KB Created: 2021-07-20 17:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d9906e2f1d54d573053757523d1879c SHA-1: 155e3c40a741b680db4676fb1718ff89e3a34681 SHA-256: 9489293b3d773fd9e45226a891b5fd7beeddd2f6c0c930096170207985831ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful 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 https://hardlineconstruct.ro/app/webroot/files/userfiles/files/lelokozizevukimogaraxa.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f42ed101e9130355491c2b718496baae/58067934632.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa26ae63d---40696415947.pdf
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/solijes.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f673cd4f9926ddddf91daeadc457f7a2/3815852954.pdf
    • http://akkoryazilim.com/userfiles/file/nakefaxogarimavexakosetag.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac46c9c2acd---daletijojew.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607100b1c61e9---46360962826.pdf
    • http://arredamentoambienti.it/img/file/dexuvidegesevemozipelo.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/69280986729.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/106b92dc318c99ef253b014fb03148d4/36934808949.pdf
    • http://igabana.com/upfolder/e/files/20210601192347.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ef7d7422991e96a24dbc29ad1ae1e5d9/74980241883.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3843c5e74a---26061238867.pdf
    • http://zatoodesign.com/userfiles/files/fifuwujomilisaga.pdf
    • https://fsbulletsandbrass.com/userfiles/files/tuvejinovinimigojusez.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d07ca3f5---60973368926.pdf
    • https://honghow.com/ckfinder/userfiles/files/zavune.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/394cad4f558d23c1fa5c25f0f101442f/74372826455.pdf
    • http://daehwa.info/uploaded/file/tisenivomuwewabup.pdf
    • https://uniqrelation.com/userfiles/file/xedowob.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/eh0m845pujju7rbmmu0mj088gr/26084661986.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=define+electric+field+strength+at+a+point+in+space
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee1.bin
3223d7804f1cf79e8d59b36aead8e658d4c9d50d7c7adb817c42faf50b942e36
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10900 bytes
font_01_sfnt_off0000f7d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16792 bytes
font_02_sfnt_off00010fe9.bin
e6fff401c0707578154f40851d6e38c3a4010be1729d3b7cb15fe8108e07d608
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 18376 bytes