Malicious PDF — malware analysis report

Static analysis result for SHA-256 2add0e26c84d217d…

MALICIOUS

PDF

95.7 KB Created: 2021-06-26 13:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5398baff1cbbd21a82e7951e16b23e87 SHA-1: ca74c57488eb5126df8eccce58d5464cb808c503 SHA-256: 2add0e26c84d217dbd3c1e570e1affcb03496a9b88c689c758d418e1d98fc8bc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

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 https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04171a635b---liluxa.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a672033682b---karusip.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c7ac83e43ce59583f5561ebc7d628aae/36896038285.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nufkdlpr5vklpn3r81iurpg9dm/96411974908.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/09qs1s337f7tuth2r7diefqtla/xugokabivilupurerixa.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021551010399492.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/dfd56067655731b10bc22ca1048a1824/kavowavos.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c88c1f0a4---11277524415.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hbcjadqfkcvk3puauu31r6skj1/8804776661.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/41330512381.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce786b5d1---woxajamujetu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083173e129ae---tirexerixapelolanepovubix.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/be07d158bf32356146525fdba0818e3b/soxazugumolipexusumexub.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0624/a7eab491a8c1726fe19c127f97e27d27.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k9omhg8d62o5bm2avr1ibinnn7/sopag.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24dbb9ac2---121212496.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050311005537.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f94abf30da6d5549dfe0cae0ebeaccb8/pelarujafi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/41d47a8b74c5ab52545add81d55067f1/feboxosoneka.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/u6873tp7gccl7u1lii9497mov6/62194705207.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38b48abcc---53675207557.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5437fb5aadcf6d9653affabc2189814f/32655417571.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/554e76aceb953a30ddcf32a1bbba1c8c/tisigonijuwonigisata.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tabomixumojisomig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+purpose+of+meiosis+1PDF 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_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C21 10620 bytes
SHA-256: dfd0764b99074178d50c0db657f64b6f2ef5fcb0713c1f08f099f0ca9db7b804
font_02_sfnt_off00014484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14484 17552 bytes
SHA-256: 30b04e2df890f6cceed392430551dc41feb8a7c88ae4bec4d83dfe6f5b046990

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