Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffc19359a2aacd0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f122a2f71d6af001203b0ad66c15f27d SHA-1: 11a5b36ce13b5f192a5bbb9dfe498159159e5a99 SHA-256: 7ffc19359a2aacd097ee0afa8fc10981477c387a0cec9e2402eecd0f4ca6e2ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The ML classifier strongly indicates maliciousness. The embedded URLs are likely used to redirect users to malicious content or phishing pages, potentially serving as a first stage for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=how+to+eat+a+sugar+apple PDF link annotation
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81d076cb7---29167187624.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/64977187559.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8400d662655a156182030d20335b3fb6/zudevafifefusemif.pdfIn PDF document text
    • http://c-amc.com/upload/files/wosubixukavugefom.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc5ec3a00---xixosonixuradag.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/fexumafubafabafag.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/tatukubem.pdfIn PDF document text
    • http://topas.lt/userfiles/file/kuvukemerineses.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/5a2ae6aad8de90c451b53c00f04fdf9b/55815414048.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/sapazoxavur.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/popiwawobajalugagugibiva.pdfIn PDF document text
    • http://congtyvima.com/images/Download/95222668441.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/77501156018.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e07104f505---lufafagolitasugikaxa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160db8ff61ef58---vojalegi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/96186126253.pdfIn PDF document text
    • https://deepex.hu/hirek/files/17067470216.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/10804514650.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2bf57ba40fc5c3d636f2951ebb9be4ac/defixusuzonabop.pdfIn PDF document text
    • https://theurbanthinktank.com/files/jezulakasiposupe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1b3e1a9---beziwasazimoronigodedibiw.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/12324156518.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/46454038147.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_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 14448 bytes
SHA-256: cd7118981ecb2899c98c73c1801d26e9b28d0b3eaf4ac6dd4c4c444f11963860
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10408 bytes
SHA-256: ed7e28c22621aa611bbff145f53dfa391208dfc9b8ec447665e257818e3d9b3a