Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18638976a1a22d7…

MALICIOUS

PDF

94.2 KB Created: 2021-07-14 01:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5d6545e04b518835732671f4607fb4b SHA-1: 16fa4020dfd493e11d7e09cf5eeb77e89baf20cb SHA-256: a18638976a1a22d7703bbfbb13976f408a8098a376d45dc79cab1b9789c42865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662652d089---tovul.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0e15f66f6c9e79eade9e3d999a469748/bedirixojudubosefosidopas.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b91d285d421a6cb1caafee961198f837/nitox.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a3d3a9db195a3ddfda3dc3d47cb5ed4b/66606773877.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c719f1807f---loxolugupalunenodepa.pdf
    • https://radmangroup-ye.com/rgfiles/file/disisubalupedenexi.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/an6jie8q2v277bqck05bjslp2n/96449077205.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16099b21ea2aa8---mejefunas.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jedujefubugenusatom.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607069e593c1f---daborire.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3539576f54---2449838519.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/273a876feb7dea201cc897a121143530/19416030539.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/520d385604905fcfc6a214b2612aabc8/92696927324.pdf
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/bekabudevuko.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/xurogogegud.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/250475c2c0eec4d3b763fb1599bcac56/5383621261.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b37ec30a2---vanobagu.pdf
    • http://drprdesaihospital.com/uploads/46570766253.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1659ae4cc1---3037280542.pdf
    • https://weeb.nu/userfiles/file/11054161441.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b0dc5ec61e6f8af7ec05ce590014f05f/pewosalalexote.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/scg036gt4klrkttu134g801p1k/dalimetizelasagujunelifa.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac18bdad7---wuzuxixaxedu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wear+protective+clothing
    • 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_off00011157.bin
aa2531f06f7b6d6f0ca850129fcf4dc3f8c3923c3a99fef5a9692d631a04dc2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 16748 bytes
font_01_sfnt_off00013ce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 16792 bytes
font_02_sfnt_off000154fd.bin
a520b2062586ee62c38f3548247d3e58c36e886deed22bec956d003565b40040
pdf-font-stream PDF embedded font (sfnt) at offset 0x154FD 10544 bytes