Malicious PDF — malware analysis report

Static analysis result for SHA-256 278be635bb9a570c…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 11:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21818553d263475e514d484b125af2c4 SHA-1: 528527c05e6a1792dfdbf34770d4fac919327b2d SHA-256: 278be635bb9a570cdc6448354187c44cc4ce377d1508e8d62cbeb598efd8a9e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links to potentially malicious or compromised domains supports the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/uokn1cbe0sdd9g91f59jph2au2/xuduv.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd9323ec1---2607038102.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/34492705732.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7n96gtn62r25sime0imfs4mb9c/43256946498.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7d82ee5d---71608291933.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e73dad9a---17570949897.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvmho7h3b39p9ttqao2ekkojeb/kinarijamimokiwifofe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36646f380---letibibokorirusef.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc78748e7a---69180379738.pdfIn PDF document text
    • https://bnovum.hu/downloads/35055284503.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/zofuradarerazeni.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc46929f0f---tofopo.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40766399128.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/11247251689.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0ba35f6177ca99a5aaaf5fd68ba2ecc6/8765530882.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725ad045068---norupotorimisub.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/tuxezenifewiguno.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddc749cdc---fepekebe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc283b3bd4---litopol.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/315ac45e20c60de9d3ea8c1ef0a2dac7/kogibopesanivafabazijuwe.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7da9407397b310efc8726eecbc7b753c/xifuvezekosexazije.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/22889889050.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/zewed.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/20149334657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+extract+single+page+from+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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 17616 bytes
SHA-256: aef65cd49f57e67f4f2a896e6ad61e6e960f20f5cc6f925b72931fe1e23625cf
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 11144 bytes
SHA-256: 4e56795515b4ae5d252bf4e8a35226d2b52f87612e48030cee02cd7e1fb1a600

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