Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdfb09dd6444654…

MALICIOUS

PDF

78.9 KB Created: 2021-07-04 23:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e4d98dfe1fe9efec2b5798b51c6cb12 SHA-1: 263e8a537d6a427ddf7a91566fdd8d6db9b6c8d8 SHA-256: 9fdfb09dd644465409a0628e24675abe4989b6ec0e4bfdee97ca52135131f08a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous URLs suggest a malicious intent, likely related to SEO manipulation or redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://gpmpoolandspa.com/ckfinder/userfiles/files/44839498902.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0521bf2aa97c9d0136d514ef9ba84c48/29055463815.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/nonurikirena.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbd2a620f---woramoka.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8qbskbk4lq47kk6iimqmjaus62/81002811253.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wirazizerozodipasuz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/83d830b019234edd5006d02b1eb2fb64/12105618547.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2052603e28---72829599775.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/dokajededutigomabi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3aa36e8f0332e6051cb420bc9ea5f615/9221693722.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/abd5de6a1c7d127032783f96883a062f/xuxeresamedupoxabafev.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f745416f8100ae31b33f74ccc119812f/29703540208.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/25196615600.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/mitilovulivakusosagej.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21115452744.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/4961756074.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/13757755322.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/dipavesovapusobogebu.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c84f0798ce54d3cc65253ee72c4d1fb8/jineposapojiwegumoritunu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2709ff27c98fe6f6ddf4725826e2c724/51643652199.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cce97c8aa35334abcb56c9210ead01c/40373550096.pdfIn PDF document text
    • https://mszukam.pl/dat//file/10756800956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=statistics+for+dummies+2nd+edition+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_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 11032 bytes
SHA-256: e8681cf674e367ee9e41035596f2865f3220c48a14ef9c1f4505ceca796d1036
font_02_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 17248 bytes
SHA-256: 554164d160d973da04a18168caf5d35772534d4b26e4052bd86e16428b5935d5

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