Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9c784fe3655c3f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 06:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69c81d5e9a801d439033fd6242783674 SHA-1: 6a0a9e5171212e207009b2b8ca28a0f5c82fbbeb SHA-256: df9c784fe3655c3f7456afc67509ee919727ea92e1d46d6f7a6445dd31ec5449
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=fantaisie+impromptu+spartito+pdf PDF link annotation
    • http://mdtrend.hu/files/file/kividu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606defd2aaaec---14431486972.pdfIn PDF document text
    • https://verner.lt/images/files/63980131261.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/jebinezulomebubiworivib.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/36123933832.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/talazowitedigafira.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/bb7cd036b3c59ae0e85937d40bb5ba28/fowetumakasomimus.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a266db9a6---dulonosajujasixo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9b40e957139065d995a5465130acab3f/27796365443.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/ruginoguped.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/litagekezir.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sokuzoza.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/k6435qkhh2k585ctuf27uikigc/93264248185.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/lbk9gdegdekqscrs0j20hmfua4/wonetuledorifol.pdfIn PDF document text
    • http://asvpp.fr/pdf/zumezewifolidevojevujotor.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf0a3a500---fiweruzorebi.pdfIn PDF document text
    • https://udruga-invalida.hr/files/tevuniwibarejetim.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xobavasadizafuw.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/xinevixalusunuguwubigavi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ddf029218---jasisedatolijivik.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/sosurawelodutitofomi.pdfIn PDF document text
    • http://dges.in/userfiles/file/84011934144.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/87366260335.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210518114735.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_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 20052 bytes
SHA-256: f986310aa3b843c4b5aa6abaf66ae88e7d32d1f419373129733b19b0880bcfb7
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 10692 bytes
SHA-256: 03cb6a4c2b4cb6d5e7a054e13b04dc219725ef7e150009b0349dbf390a7884c9