Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22e2ce5b085a309…

MALICIOUS

PDF

101.5 KB Created: 2021-06-21 13:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ac49d11a3ce1ff4d645ba240d5be1787 SHA-1: 477d4d7548c8bb5aec1dd7ce399b41f0af1c8eab SHA-256: a22e2ce5b085a3099a00a225715b4f7dac9e2cccbf5c68e63d54b985051aae32
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8751

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ajwatravel.com/wheelmarine/userfiles/file/56221773911.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95be7a15c---60047540718.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2052610a8e7d312fbd418f37b87e5979/55424171553.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b676e297c8---82547219480.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/eea249ec03740cb8917d1acd8232b807/lekujexovewe.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827a72b3697---89420174602.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cf4643a6---36809513879.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7872d91345e2a917d3d9eeadf9d5aa99/defosu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ad8a55db622ebf99edbb0149129f21af/dimesowexetemukumikoxapel.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/bb07f26694e5e2754849a6b2a0c2c99d/kavemilanirorubajizutetu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bccd5a9bd---96608335972.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33f807c81---50861904436.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/tjh9mt19t0uoldgcggldjhjerk/wikowiruluvajofekiganukem.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a118ca36fd---xopotapinuzotiripeno.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/15168870316.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/6655397143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kagune+de+tokyo+ghoulPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001107a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1107A 22948 bytes
SHA-256: f73726023a35cd2dde888e41e67d22d9ee62630ee629f9df7ac0e57af370aee0
font_01_sfnt_off000159a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A4 4948 bytes
SHA-256: 85ce2008dcd70943ba6274edf2180556ecd3f50b42469d03563c49379b7a64a0
font_02_sfnt_off00016a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A84 13036 bytes
SHA-256: a261c0831a39e163f7109cde423f41395289e26a11f22b54a80187f484fc9778

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