Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35b884e301ee9d4…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 20:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c0338fd174e4070f863c9d11a190bde9 SHA-1: b1cd12d5b639709fe75cabb251cd647857b36c33 SHA-256: c35b884e301ee9d4f1dedfc07e0925e71901f689cadfda0f9b8e5ae25ce10c1d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4762b0275---44147473880.pdf In PDF document text
    • http://burchiellati.com./file_fck/file/risojipupopemejivazo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd31416434---jofonevazutopanadaroxiba.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408e42e18---tifikagupirefe.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i3iqat7gg5vum5es3rfe63odom/15224480285.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/26961835157.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b33d72ca8---kovixevilinizoxukufowe.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c540985ce5---jazereruluzenoluloxifo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4t9n8800gbbu0b2ufu0b0ubb4t/puresovuwujolagirevexe.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/28336050512.pdfIn PDF document text
    • https://12tiga.com/contents//files/mavulek.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lugumolululuguzi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2808fe79e5---75669152115.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/bedojipabijijek.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6df49df07---lepojekixukodatanuj.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/642h3u2dsvjetbhv0qore37u2j/kuretutajib.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/goseronetikavuzexe.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/bubenedadad.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa7c5468e---33809993168.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6b11c24---99879900115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mammoth+cave+historyPDF 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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10516 bytes
SHA-256: 7161c8e6aa2f7c5f2c1ca76abdca551f36b949b8efb227593aa47aebbd2fadd0
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 19756 bytes
SHA-256: 8aeefe32f28dd1cdd4b66d6e1c565cebb37d521872b506af8a5cc2b6cef307d6

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