Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa61bd1d352e98e…

MALICIOUS

PDF

93.6 KB Created: 2021-09-06 09:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da8e4ac2e75f5e761641210c4bf96963 SHA-1: ac5335f17d3490e451fe344eb1799f9a319a633d SHA-256: 4aa61bd1d352e98e1f8610df501ed99811c4f1455edfb82aa811f4f2e3ad8ca2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40293c68ee---2858810306.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075978adff20---sofukomusisep.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/88426927300.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/moxub.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/veperuluvekoni.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/41589427506.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b6d18d43e6ed8f1f58d0e268e853393e/dozubuwofovumokexujeluw.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d9c726d91e2dcdba46d02d38a00fc1cd/79994338402.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nuraributedokem.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/nureporizixukanegube.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/90971292307.pdfIn PDF document text
    • https://brakos.it/file/mewakobere.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/regaremoguwipanulezazod.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0af9d3fa---22660367048.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809198bbd33---fosolulibupitexolun.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/3833733379.pdfIn PDF document text
    • https://banghenails.com/upload/file/67997809435.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/xugud.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/kiruvawuwik.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/70250101456.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/b1188t365mc7e2raepjppl8dg3/35235969314.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/senatuxubulokiwonu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d23c36ac1---26304186830.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/98066641878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fundamental+automobile+engineering+pdfPDF 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_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10892 bytes
SHA-256: 637c667cef47322d07879595b84a70dda1bef607a8e0b4af5118b1d6b9833dd2
font_01_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365D 19340 bytes
SHA-256: 24782baf842f3374379068c03c028500938b02a7857531961d76987bd214eb84

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