Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4752c48b2c41463…

MALICIOUS

PDF

68.9 KB Created: 2021-08-18 20:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9dd70f810a32e227ea49a15b6711f37 SHA-1: 93af29dfc84bf8755a4e1778b6d5e9bc3359ad26 SHA-256: e4752c48b2c4146352bd445ace9129286f4abf78ef256a65cf1c4f594f323402
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links to compromised CMS uploads reinforces the attack pattern of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8460

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 https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a25c9740---14573313563.pdf In PDF document text
    • http://kibbkw.com/uploads/files/zakojov.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/950e88371e6ed981b302b16b45503b89/pupevepepatuwuwuseximak.pdfIn PDF document text
    • http://abpaluso.com/upload/file/posiniravemakenijujepog.pdfIn PDF document text
    • http://chieucoingason.vn/files/sixokotaz.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/24395762492.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2c7311afffb4b180a8eff304cc9e71be/33824906908.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/81106660320.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/sudisur.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xokitawafobemaxam.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16091e544f23a8---zerijefofosifuludotezo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7eaf3dedf---sidekinubebof.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/84504820235.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/797278d977de7a0b2135ceb14bcc8ed4/xapuwajosibegugej.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/defigunibemavipitijedas.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/tufol.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/19298622711.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/1395554566.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zadudizitawo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d9013625---14404071083.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6195b042d---wowetewem.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/28/file/gumijide.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/29615064442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=papa%27s+burgeria+apk+free+downloadPDF 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_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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