Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9453472a08f55a…

MALICIOUS

PDF

105.8 KB Created: 2021-09-02 23:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 924dd229e188c5ba6e98a957229a6817 SHA-1: e539cd87311982a577211e79031ed8360816f940 SHA-256: 8c9453472a08f55aa9e4650cd7486cee7fcf8f94d92a37f16690216ad4c2ad88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised domains or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://georgewongdesign.com/gwd/upload/files/86549873370.pdf In PDF document text
    • http://perles-del-beya.com/userfiles/file/4867743351.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/dapol.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/wukavoloka.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/k3123rntpqkod2md5piipb7akt/37175427686.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2dd553773---luzebon.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/gemomid.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c52c29b7d---xabaw.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196b0fbaafa---89294003899.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/65040952196.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/79876197032.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/68150042645.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/meduripipofal.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/gemenikekaxaji.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/131e50dbea3ca81c1f16230c27996272/waxelimasojimezexibo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/84546895548.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/53277475664.pdfIn PDF document text
    • https://plasy.com/uploads/file/97888873932.pdfIn PDF document text
    • http://ligneus.hu/upload/file/defufukijumoxegibarevo.pdfIn PDF document text
    • http://newshop.jp/archive/file/43367092156.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5lvo7u6r7t6ftgtlu63lgh9d1/83726957016.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6fc45c223c090c4ef0104fc72513e434/96612164861.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4372747bbc668414335d4b49f691d64/27155010999.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8004c8c9e18d1d3de931bba84d901032/91450774349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=principles+of+literature+review+in+research+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_off0001378c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378C 18472 bytes
SHA-256: bf5ea2bb88127414c3daac1c69f73a524e1835d0c3a49930e0c9ce974e827104
font_01_sfnt_off0001674a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674A 10972 bytes
SHA-256: cc83a0da8e274bd689e162a621f9164c4f2c944bda695f7a34b013925829dc66
font_02_sfnt_off000180c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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