Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5a2f524743049d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 04:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ea364b2532c85097c28b0532b9bd06b SHA-1: b3319ba4537a0a6437d888c877afe4ddd5c0aa91 SHA-256: 8a5a2f524743049db534d0ce8eb614cc79965b957f14bd25ccae45ed8a1b8fab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hogozaty.com/ckfinder/userfiles/files/juxiruzeda.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd121ca64---26587544121.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/18546722250.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/xiwawi.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/sepoloreniri.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c9e82e6a---65857324963.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/luzopufazawexupoge.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/84064408982.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/uuflm8u9cj3l74jp7934bqjpk1/23564156674.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/pugumox.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/irmsinj483pa2g7jfvnajijrjm/surezelinoveregapuwot.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/36477300914.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/62306852068.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/muzikutifebelavusoxuja.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/43dd9bdddd5cc67e279b321886bf7a39/4472225880.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4354e670e6b4400c5bb7c803a7308422/wetajuna.pdfIn PDF document text
    • http://p-energo.ru/content/file/nomojorom.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607654257b3c0---98275001995.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56631334161.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fhhlprthd05b2cc2n8fv1n99m0/zogumebaxodosokates.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5b329678ec11c8ccf394a183e930f88b/majomigakudadojap.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/wuvifajilolufuneritozeso.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ffb9b98b953dd62d492538c56ac9c447/42831144551.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d49d7bfe1c85978eed5562f5774c2e2/88344359461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=polst+form+pdf+georgiaPDF 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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 17368 bytes
SHA-256: c0238937b861ff974f04a1ed2cbc9b3d2a09fb735fd2b4f9de8e39db20a7a282
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 10740 bytes
SHA-256: 288ba55bfbaeee8f00fec87031283184347135dabc09da25c3d67add323ed973
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1