Malicious PDF — malware analysis report

Static analysis result for SHA-256 272a807f818bdd8c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 02:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5db188c639980cb67bcb3542320c62f4 SHA-1: c2708867cd1726a3149ca2b2966718ac7d5cdc5c SHA-256: 272a807f818bdd8c5deb4f8cd4818e599b03dac3a81bac63ca6906f22d87c9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. Several URLs extracted from the document are associated with compromised CMS uploads, suggesting an attempt to host or distribute malicious content. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3d8b3ecd7cd7a8c7987d4a59855d3ae1/soluvilaxewiramebezajodun.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7e44c15b---zoxemibum.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mebadotafak.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/kubub.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/54781984442.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc06a9897c6---33366417591.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/2910329385.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ddc9a17c---mewomojarolalegefaguxuw.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1s36h7vlor70ghqrsd664pf09v/jagawuruvonutotaj.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/lawomufujal.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5je1t6sm3ne9a7dpo6q0a79ere/6270405048.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/lutidavadigo.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/45349426715.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbc30fc2e---gotumelekigo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160757fdb6d8f4---befujow.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/pawusolajun.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5092c278f6---pajil.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/nosisidinotonevuxaburefar.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6f11fbd98bda779d761a814e87f6d54a/bonodosiluxokuxowasili.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/45601022358.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/54865463972.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/poxevudivupimeji.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1de468cc8c93e03441840b77debf20b1/96132683757.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/16615453372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=blender+character+modeling+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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17292 bytes
SHA-256: b22c733a8112db4cc49777e2132d6d3a281d06a0f7817fd3e70614f128f73aba
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10952 bytes
SHA-256: e618384b09f3120d17e63d7dc27e40c473501bd58d26dfccfc2bc029dde66411

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