Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03c50586543dde2…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 02:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e77163346e2b602b743d21a476fbf72 SHA-1: b30933491341beb35627251db5f986af24d6bd7c SHA-256: c03c50586543dde2b79f714c9a5abaa6e0f4073cde4a906b37193eab296f6626
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 WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://chcial.ru/uplcv?utm_term=true+story+behind+she+fought+alone PDF link annotation
    • https://condominiobrisasdelnorte.com/userfiles/file/wogisa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c884771ba53---64952916008.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4dc0a5f28d7579907d7f4c453f4d37a5/leroluzoriroze.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e143417a3253c3ef42100c0a39df4013/81626590950.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/38052446191.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ch00jl255tsje4t165lh076sje/fobegobefarewovomilot.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/42461684832.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41debd7ee---34948860808.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/liligabesukaxib.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dejoxiwuput.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608203986129a---pegosijopazet.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d62401c04---24109345581.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/78032789256.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/72094768005.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/99402284348.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/96560994753.pdfIn PDF document text
    • http://vejwun.cz/images/tatusewijiburovunanave.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/87570815143.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/85116420008.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7a87fdca---81475391560.pdfIn PDF document text
    • http://bociany.sk/media/file/32584224466.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607416eacc59a---6793900610.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801c0e38731---dufatesozaz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/bavozur.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2ee77d89efbc04557add16029d7d4855/voritewutitafonudedu.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_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 10948 bytes
SHA-256: 98df901c85750b86afd0a11279f6c2016df11ca8119a1e54c1c19b85670f5bf7
font_02_sfnt_off00014151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14151 17192 bytes
SHA-256: c4560908acddbc2c0f41725aeb7c77702b56ca83b3e5adc7e877ac095ae6e4f4

Open this report in the interactive analyzer, or submit your own file for analysis.