Malicious PDF — malware analysis report

Static analysis result for SHA-256 169ebb36105224cd…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 06:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9c14188301ee90149dcc409b40cbf79 SHA-1: c607b4d99c7bfc64097a3ca880429badaab477de SHA-256: 169ebb36105224cd38b81037b59bc84bf13781664cf471f69a206aed246cf3f8
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by multiple heuristics identifying the PDF as a link farm pointing to compromised websites and disposable hosting. The document's purpose appears to be directing users to external URLs, likely for further exploitation or to serve malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=business+studies+fifth+edition+answers PDF link annotation
    • http://galluccifaibano.it/userfiles/file/29406123685.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/feo2gnq6rj0j2tscr3ipq3u7b0/disujixarinazegux.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/415b32b12a879ac98c77d0d9d50a1ebe/digubuwuvelo.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/goxasozopuwobudoru.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbee4e198---mikuzeganupojusefij.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7c223589---mibotojigekux.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8fcbh6s85v0iqe7nb39bk232d6/mefaleturuxeviliwukeraj.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hbmosnuib8op9373ncdk2vi41i/98393089008.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/sozenudi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7b0753b42af02a547909688351d6e796/99572092615.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/64416024815.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/60022786802.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5987c6c9d9---12160617611.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/61378644782.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/52732879145.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d33b4025317fa2c4a07a3a4518ca9431/jatibapot.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/potupexedakunex.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/15690044955.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pinagojumaxitodofadiboli.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/40879140460.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0r8jkkrs2aqpqmm1nlh5o78v5g/78363635181.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086016b989a---84391343141.pdfIn PDF document text
    • https://tigapilar.com/upload/files/xojuvam.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc04bb2ea48---44603966179.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 17748 bytes
SHA-256: d7d7966ee8161a1df42244cb5410f41debc3956b0257ef9cf376604848f7d10f
font_01_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 10644 bytes
SHA-256: 43813a8b22f05c2d4c16a17bb4c6383d34cbaf2643eec2e045d199959345d6d6