Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d7bf79d2557e3f…

MALICIOUS

PDF

57.5 KB Created: 2021-09-30 22:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f8242f8784c2c5efa3feebdbd7687a8 SHA-1: 4cc738311cb2ddd66f3ed49ce55aac426764bf2b SHA-256: 34d7bf79d2557e3ff5c98994b2016230b7b56f127e57cd557d60d2bcaaf46318
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, which is characteristic of phishing or malware distribution campaigns. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8079

Heuristics 5

  • 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
  • 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://clear-es.net/yamituki-n/uploads/files/dobajiwunesuritado.pdf In PDF document text
    • https://rireenfrance.com/images/upload/files/ribuvu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/96608834364.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/56206386003.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/30661074095.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/54713377788.pdfIn PDF document text
    • https://edusfera.pl/upload/file/70584512942.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/jidonobewatobewotufafonuz.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/31941243520.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/fejanafo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gigorejamifopejevimuf.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/latufode.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/togomoworulurom.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/82934707219.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/sojigegaliweveveb.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614255fde05b1---moxoxiwamomaxob.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/sijegamejexowor.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee2fd59fc---48990236093.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096ced3723---82778056200.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/20703866513.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/66325305778.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/20848248128.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/97751751144.pdfIn PDF document text
    • http://home-plast.ru/foto/files/jazixilajuxibulafijig.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902195856283319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ethical+hacking+book+pdf+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB196 16044 bytes
SHA-256: c7fa683e3fe9fed096687a2eafd6d6b6da07f17f93b81ca1ff2dd999c9258e91

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