Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b54922209db1eb0…

MALICIOUS

PDF

86.9 KB Created: 2021-07-30 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5e0e71afbb365aeae48550e7e7d7554 SHA-1: dcc032d387a0afcb299b15789e7f7ab941e7b65b SHA-256: 4b54922209db1eb049c6896af260d344d8c83821572b3c844d939fa3516f691d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=can+a+dermatologist+diagnose+allergies PDF link annotation
    • http://nicenpos.com/userData/board/file/wedukorewijixoxap.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/63d576b6d589204110b6fca423cf560a/gukepi.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/gazutitub.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/niwuwebonejalepe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4138cbca7---31600691126.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/96383587444.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b466972b999---7053928315.pdfIn PDF document text
    • https://chptravel.ir/data/file/52916780203.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/vaxisavo.pdfIn PDF document text
    • https://stauber.lt/images/files/femuruxukuxivarabagi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c858d13713c---kasodibinemifam.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/gavedakibo.pdfIn PDF document text
    • https://beliangka.com/contents//files/zosupupirusofipizexub.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/terusafomulotowozabata.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-14/20210714152251251208.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kivixalasurone.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9a144c4f857d8b54d36a5e20ca19bed1/19369852810.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/xesodopa.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f12c63bd8b2---50172473137.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af32ef3c57f---tadivenego.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/lesoliwuvetezigexef.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4016f0623f65ecbbefe4eff8b35fb091/wewuzewinitozobezomo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e127b64162c---77609039928.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a567537e8cd---80852762412.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/33404701084.pdfIn PDF document text
    • 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_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16372 bytes
SHA-256: 3a60a58e12bf778f011daddde99da1c1a9042f3cff3a8e1ed14f70f55040744a
font_01_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 10620 bytes
SHA-256: 2a6ec4ee2052d44b1c823d9beff45f45a410608f0026fb01197c04df6392e5d2

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