Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9a340f697f4db7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 08:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5cdfa076e9eced345aaece4df3fec966 SHA-1: 94937b8734d8ca0cf9374ed1f73bd380b6442ccc SHA-256: 6d9a340f697f4db76cc0d4621bd744b4bd1ee542684052dc5df53b934761d332
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://domusanna.it/userfiles/files/98595484332.pdf In PDF document text
    • http://premiumcsp.com/uploads/files/kasepuvelumim.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/11380644475.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mulikizokased.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912044927.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/79526894697.pdfIn PDF document text
    • http://kag.fr/userfiles/file/3924496370.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409f42a6cba---37967606786.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wewozimituxikomo.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/52226110531.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/49066249779.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f0941e9a---pavugoz.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/bowekemosolusa.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/pobog.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436c64e2535---gefidorag.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/41201211035.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/l05p5eocdno8iq97md6kbipd8d/94953496139.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///kobelamelotezel.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/nuwizunometawomikab.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32194666775.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/84bed71785383678fd08ec8ff9b14d46/sobunexomolixivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+lady+boss+full+movie+tagalog+2013+hdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 11476 bytes
SHA-256: e24bda8fb0e5f54dca0819dd402fb7723c4f018d94724cbb77e038bc422e1095
font_01_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 20556 bytes
SHA-256: fef35279340367f026f53eb2432502c845b6e8faf50865ef873a354ff0867b6c
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 17532 bytes
SHA-256: 620e0fbd8f7e7b151c12f6e607acabff303586541b6653778e6fe7b2b97ed9ce
font_03_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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