Malicious PDF — malware analysis report

Static analysis result for SHA-256 1935192f7c55ae86…

MALICIOUS

PDF

157.8 KB Created: 2021-10-12 00:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 570f515727e991041c8ef63d298e1671 SHA-1: f7c4cd0322c5ecee110f2f145d6704f43de6a20a SHA-256: 1935192f7c55ae8617be95424644bb249acf752186e5a5dc362cfaf70861f640
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URLs confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=mythological+creatures+in+harry+potter PDF link annotation
    • http://www.ih-consultant.com/ckfinder/userfiles/files/4522419992.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/43409390695.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kakenuludi.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/55924676458.pdfIn PDF document text
    • https://computerzone.pk/file/kixojarusoxukorinizagidin.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/23928143257.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nofiwetup.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/kagujegubag.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/28orb7e9sba12ns4fdt7sdho5n/26196365092.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/30705658294.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xoxasuvarewiliwox.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0e8ee011---95666125442.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/segujerosumubofununubox.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/wusivade.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/pizodepelemezi.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091208173773499.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/28588389952.pdfIn PDF document text
    • https://medtek.vn/storage/file/6532768856.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/wilejakuto.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pg5h37h4t6rald2u8rntev2966/3819848683.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xobikavimidikegodit.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/37023372839.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/masolulemik.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///xuxoxiramotupubej.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lupovilasugidugasozedu.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/bozabetu.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_off000200ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200EE 10860 bytes
SHA-256: 83eb2cf49e9e3bd360721260a261d2259b1a366b8926b8fd7708c9196296904c
font_01_sfnt_off00021a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A04 21212 bytes
SHA-256: 5bac15c460ad268dd090e8e77bf232098c5971841d693d4123c696a844adf43d
font_02_sfnt_off0002511c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2511C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1