Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fceef64dde91c6…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 16:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02b59f04447c44513d50f1825d43778c SHA-1: a7de9aa3683386013bfab361dd9570699235e60c SHA-256: a2fceef64dde91c63380e03db72b5f1278d2518ddc7e8bc0a03df4946350fe28
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or identified as disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific attack vectors beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://kadh.kr/bobod/upload/file/jomogajusowevisalajura.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/gudokazuzirowifefop.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c7fd1c83---7040998818.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/94065514563.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/pikatorafit.pdfIn PDF document text
    • http://flexicourse.cz/res/file/47468822725.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/xosib.pdfIn PDF document text
    • http://akademibt.com/resimler/files/lanune.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/temonejudomep.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dh36ukoacg3aftj9l9uv7418uv/37079386987.pdfIn PDF document text
    • http://iwishop.hu/file/wawilubufonopux.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b37d80a19---xokanuzumel.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/79392428880.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/34801665058.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/30240444363.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad957ba19dd---59848397179.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/n5cackbbibou6t2m0ucsud3ot6/29636593511.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722247e12d5---jagisanojubebogaxopat.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/99607153446.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/82bafc90862a34addbfb2062eaec1a40/83775340075.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9fsffcfigqrv1fkotiqtgblqki/82089888067.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9782ddf4a75f6453a97e04fa15ed7694/vutikagijovoris.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/vulutolalamikovegopikov.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/45483550352.pdfIn PDF document text
    • http://proxima-design.cz/files/file/98870177192.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c085a97327a---34467608593.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210813024330_8x5rs6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trigonometric+fourier+series+solved+problems+pdfPDF link annotation
    • 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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 11072 bytes
SHA-256: fb7968aa4f3378580e193a84716b2aa7b7a054aaeb4a973ba49938cfe3dd6da3
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 19596 bytes
SHA-256: 8c048f85921caf0229c396d0c1f97056d52b5d345385e0845d559682e32051d9

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