Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ef3a495aaaaf0a…

MALICIOUS

PDF

110.6 KB Created: 2021-06-29 21:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 87d9490af7563bba5b1f0be5e8e3b8b9 SHA-1: 6f8404995d62475504d2bafe470029c89615f20d SHA-256: 27ef3a495aaaaf0a9d4da678d2252757a10bad27e6b34abdd508bddf0fab67ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to potentially malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ahkjt.com/upfile/file/nelevomegerobijo.pdf In PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621068000.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b6fb861b---didipu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/68t9fd36rao75294rc3ukqjn4l/ninibol.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/uqcg5jtt2th8lde6h3jss898c6/xotapugefanosigadawa.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/37193e519bbe15b669921e46f2cc7930/83715028948.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/vowigevamulokezu.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/19135521208.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087d82c119b8---46293328612.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097455a46a75---92559421226.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d173c7513c---13618317822.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///18680134947.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d030ee39---sepokoxaroxapitaw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g56hcenllk4o4uh1m0ju9qkkv0/vutawinavopi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/baeccca14c10f9065403755a4920d98c/51361393784.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7k4214eavrt1qmbhsvi4j1lj75/berewamoke.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7236d23752ee836dd68885535f9084b7/vuxutagitobo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607322dd845e8---fiduzudiv.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/vasuxoxarutajikenoge.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/810171275.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/32174127117.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b399101dc9---11912403236.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tomq27rdu2967j5si2jrnjh4mt/85910308335.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/65747163941.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29cfeb975---13869983947.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/6c8f35577714c083a96165024ac099f6/zalamirebuvesixifojiga.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xarixuvibelugufujifigov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=idioms+and+phrases+with+examples+and+meanings+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_off00014df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF4 17276 bytes
SHA-256: c4a1aef62df7d0a6d2369db4a0f7d8c3b9f09d34262b8eef18f3d3fb478d38e6
font_01_sfnt_off00017ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE8 11084 bytes
SHA-256: 265f64630ebbd9096b7eeb1b508bfb87ce7279cdc667601a967924a6bed669fa
font_02_sfnt_off0001945e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1945E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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