Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca6d6a92661f583…

MALICIOUS

PDF

91.1 KB Created: 2021-09-05 23:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e22e6c73b9e86b4283842ec3a48a49a SHA-1: e78b6b02abd4e268595d757c0dd4fa2ad36d81dc SHA-256: 1ca6d6a92661f58370a96064abbb14c9322b7c481bcf5beb87e06bae6c8410ae
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of compromised CMS upload links further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://ketchas.ru/uplcv?utm_term=cheese+fermentation+process+pdf PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/waronal.pdfIn PDF document text
    • http://katachizu.com/img/news/files/dimumavifoxoti.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092861171a41---gamijifuriwoxitok.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/660f3abad11195d1412dcb5e3ebb90f5/lodirekiwu.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/bakiwirisipoxa.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/39269431147.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a1b5b1d678e3e491cbb3314d5b209cc7/muruvibonitovewenupipeno.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/83611755268.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/39523043427.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/981467351.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/rukinisotabozajizavosasi.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1lqn0kn9gg8lshc6ehep1jm4l8/bifewagapawabeb.pdfIn PDF document text
    • https://bloomeng.com/uploads/mojutodilamozex.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608673e6aacb8---lezuzewavab.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/737e47a547616a54854a8fefabf1303b/63411117553.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/18033803299.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/wefedavafilived.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/63679877191.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/1860231869.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/abnsa2o8371n230bda001t2jue/zejazedefazujumevapife.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mogulomazefurugiw.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/75007180826.pdfIn PDF document text
    • https://airbays.com/userfiles/file/42416428070.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/17190413749.pdfIn PDF document text
    • 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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 18592 bytes
SHA-256: 583a0a72b8ba1f917a021338ae2a3c51f4ca1a399219550318d23682516441c9
font_01_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 16596 bytes
SHA-256: b7d86188fb90800d95dfa978a3bdc438b5e277dc57ff56671dd4d3464d605949
font_03_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 10868 bytes
SHA-256: 7b2810d4496eb5968bdd83a91ba046f4a97fb5b71fcd7c0280dc5b4992374e93

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