Malicious PDF — malware analysis report

Static analysis result for SHA-256 88effa1cb69d303d…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 12:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c00923dc1c9d34fdc86cdf355c5d045a SHA-1: 1a6f964cf120da3492b70cdf6444b8614c142daa SHA-256: 88effa1cb69d303d05105e33a760fba9c8f48a08572b959e4026097926b37a94
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://amdind.com/userfiles/file/giluwevu.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/redavufu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5c28d96fdb4530ecd7d1e2f686226b79/51712634375.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608978b85c5b6---tubijelibimikesapebezuni.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/507df56d56d49c0175f05878c413c97b/leragaro.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/60702703262.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816ca58cc46---wawuzunosojokefonipo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c3d4ab1d---fetenan.pdfIn PDF document text
    • http://poorclarescork.ie/images/70746455055.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/98775436878.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/powudi.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/72002019872.pdfIn PDF document text
    • https://best-label.com/upload/files/nunuxe.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/1687226724.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed760ebf51---70213630041.pdfIn PDF document text
    • http://htcable.cn/d/files/zudefusoxajidimu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/43c2959db407ace4056f4f845e9fbee5/nelaj.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/pukatadovukurexem.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/30f91264fa58d598bc19783c5969061f/judoborijewud.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///zefumuwapagajupitobe.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/lexini.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/89524810492.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/waxuvujuzodisen.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5d2410fcd9f263f4afb9876898fa168/dofup.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c25ac31d---gogopafepo.pdfIn PDF document text
    • https://digireg.lu/upload/rulawexazudobepoxebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+cute+cut+pro+and+kinemaster+diamond+for+freePDF 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_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 16912 bytes
SHA-256: c00b1699f4801fe3e0bae216d79a51e8c1a05a85377f15018630bfce450b822f
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 11188 bytes
SHA-256: b5e893a214518b018669eb552c0cee17e54f69522d9d95f688becedfe9f1e224
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1