Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8e16083ba617c…

MALICIOUS

PDF

88.9 KB Created: 2021-07-18 00:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a6ceffcb0f3ac6027ae6802fa4450d1 SHA-1: d217f17be2565c74a1dc44338058a78d71c4a499 SHA-256: 5bc8e16083ba617c60abc8a34a2434f5fb8f8487755567ea9ecb86fac3f4064b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, consistent with a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2af830a7---pofexusut.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0dc50985a735aff0ccb0aea34f83c0a0/begidaxisiseruxubobezi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30ccf389a---78374494749.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e646117721---33760938137.pdfIn PDF document text
    • https://elitediesel.com.br/ckeditor/ckfinder/userfiles/files/mumuwase.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/pisisimebetosuv.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wamawadonibeguvejakek.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608755da3d774---11393866119.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/42462813504.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f91bcf4e408486867d3549521ca0f445/73183779573.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f34789f3383---dekavepipurotoloka.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/75319301432.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b23f4f4---vatufemoguronusake.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wusinalidokimiges.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tabuluvapetixunini.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9c8c0c5e5971277abb282561d0a01f80/ramavobotibepin.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/cc236bc127777aec60b49d69263d7ce0/jesanimerazujipowikunuj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/katanogawetofolos.pdfIn PDF document text
    • https://maisonforville.be/documents/file/lotokefaz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/2241041f1aa62b31fc07b4291d955c4d.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746f9f38047---46228553576.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281524568584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=managerial+economics+questions+and+answers+for+mba+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 17988 bytes
SHA-256: 453356886c3bc28e6561f659abdcddd2e71ed96eff30bf0a7fb7aba5643e509b
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 11428 bytes
SHA-256: 9c20938fdd469c2c3288b9fdd625110f01976dac685650ad6d4a1d6abe4be9a8

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