Malicious PDF — malware analysis report

Static analysis result for SHA-256 a803b557dfd0e5a4…

MALICIOUS

PDF

128.4 KB Created: 2021-07-13 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 856b1c5336809360c3c50f03c5c04772 SHA-1: ce654f233cf34a3a711363f963afdc3a17429b02 SHA-256: a803b557dfd0e5a44aa0401a4915e2ef466a9edb42e79ac4c293484d0bb792c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points to a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crysiq.ru/uplcv?utm_term=george+lakoff+women+fire+and+dangerous+things PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a3b3e8c1.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/69381586722.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9f87d1e3afa1997d6fe2680b61345f75/pexukasujizewemiwumiwazel.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/81429866759.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fe40f707301b8bc59e82960688d5135f/67004416679.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/55772146784.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/jegizipimivufifopikan.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0e5ce623e0178a7dc7726fab68680383/gafodin.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980b06c1816---minofikemutab.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608705a57fdca---tomejegazevuxap.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160df4d944ab7f---53799891424.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1c9345de61082c32e4a8fa2cd7b4065d/latanutofeduguserite.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/81490971856.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8f61bb5---soruzubolinetewojixafeja.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/17847124238.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbc74203e---8072762558.pdfIn PDF document text
    • http://texmet.pl/userimages/file/libulenegerureluvojaga.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1bb2f5f14abcbff942cfbba82c0b9de8/21694095876.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/nofawurafezivazamikiv.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/99800053733.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1o5ekh13u75e328f9a5brmr69u/13761688111.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/wizutomoxavawifivomul.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/39958650555.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xaxut.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806fac8e33---suronu.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_off00019444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19444 11120 bytes
SHA-256: 76d7a22ff566dfb860f06e2a3a3e21e88b530cffcee625a89371834317183da1
font_01_sfnt_off0001ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5FA 17260 bytes
SHA-256: ae48a021af7cacbc4f6c945c4569513d3fdb3fac98b6d06a57bf8fcdfba440c2

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