Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a9ee48e40d4a17…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 09:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd5dcdf19acf21397a28f6305332ae1b SHA-1: fc59ca6ddd725cdc1625e238369527fa3bbcb7c0 SHA-256: f6a9ee48e40d4a17052345ca0dcd82f972f42986a24fbff28450577d1c43c930
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests a phishing or malicious redirection attempt, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4647

Heuristics 5

  • 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
  • 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://www.niziointerior.pl/upload/file/golanobisazivezutofonur.pdf In PDF document text
    • https://fong-cai.com/upload/files/24291120498.pdfIn PDF document text
    • http://net-marketing.hu/images/files/genixedowibe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b16b1054---nitewuj.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jesegidido.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/mipetoxo.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/loroxixudurorasusapomotev.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/32400231688.pdfIn PDF document text
    • http://www.celso.org/download/7603897141.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210908065800.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613228da484eb---7020131063.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/simifopomawigeko.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/wumodonipanezof.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/pilujusu.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/96007487471.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8e87006f---99441299487.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/velokobogulexofilu.pdfIn PDF document text
    • http://underbutter.cz/download/foto/sagidelupopafigoted.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/keposetu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/vokovenasagoxegi.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/45945571660.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/22692443858.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/13758786368.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/io1tpsrfdrml27s6m042asjs0i/fumeronifomi.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/potabufubepopetorisukemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=go+tell+it+to+the+mountain+pdfPDF link annotation
    • 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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 10636 bytes
SHA-256: a20b4896dcbfd1981ff5d5ef382924baadb7853fe58d35d580590388a9ace03f
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 17364 bytes
SHA-256: 26bf498e92510a8b64eaf12fdf539112e321090c593fac2c774f984dd683e155

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