Malicious PDF — malware analysis report

Static analysis result for SHA-256 228645589ff01ead…

MALICIOUS

PDF

100.7 KB Created: 2021-08-01 04:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab1945d7b3888dc67a00297947ebdedd SHA-1: f7c32e600b05a1c875559e45db6b4f782fb8eea6 SHA-256: 228645589ff01ead234e1aa01fd052614b63ca49d5132936f7f9be5f7af5d4ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afa197cfe---46515512851.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a77e9af---wevalozepabapibel.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/xujuwokavotalatej.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4tap798ct5fodte76ftbit41m0/rewabutetajizoban.pdfIn PDF document text
    • https://tsegypt.com/file/7743598732.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/pofojotem.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db7092e33---80063786446.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/19f26704ec65b74df1706c109f10ab3a/49819572426.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7707e705---77693965077.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210714_70F39A3D9A02180C.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/23621828829.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ac379c33b---wokat.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jonodijogikozeratoxakof.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a04423d35---finamafolidimofinako.pdfIn PDF document text
    • http://hevolta.com/upload/file/pegibugerewakonezifuri.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/lesodelejipaxanivudu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c9aa8186---22667421048.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/58082901049.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/k24hh1ls37ogscvjvg2q3cvv84/98327513641.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/o6t4ep35spprr3t7o8kqk5rohk/zafokarenojemov.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a92dc670---jomoguzirip.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/74353ec67b184620bde4ee7c9863e7fa/vuwuvozewogivumaxokoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+message+of+the+story+the+two+brothersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fb38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB38 24072 bytes
SHA-256: 32f42a9327f3638d2e34009dd61277c316d745d16c595e072699348c7ad6f008
font_01_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 10844 bytes
SHA-256: 35dc85b63a987335a3d93df749a8d93918c52c242bf8112036bf983a46ff10a9
font_02_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D1 17048 bytes
SHA-256: 1dd23b8f632f237062e3c527f5da595da7109043959a57e91dbdfd2acfe05f4a

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