Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aa3c67a0d1a971…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 00:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14f9b081cc5e7db5cb155bd38b9307a0 SHA-1: c4f8838f3ef77b8a2582a1e11d0e2e0515b8f72a SHA-256: 81aa3c67a0d1a9713c824f4dbe9a1d608e35c55835e49b3686f3c1444a9c24a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various domains, some of which appear to be compromised WordPress sites. The presence of these links suggests the document is used to direct users to potentially malicious or phishing content, or for SEO manipulation. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=best+app+to+transfer+data+between+android+phones PDF link annotation
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/42465136001.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/wobusizudemofiripel.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/87464883776.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/52735210672.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350ca5c5080---30640434214.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210911_002101.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/baboseteju.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fcj3r1s943nsk4tn5p7uargaco/55732980225.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cfd25c7e46fb8a9111bdacf0fca60686/xefajiwapej.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/78019107082.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210907_AACF7B5808F9736D.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/verodinewodoxelekitaneni.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9973627f---renidate.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/zogufi.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/86530405222.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/61310816198.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/fawoduvedewow.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/43574266210.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461b01d653a---gowemakugenesufetuzo.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/57367406290.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137307312045---demadim.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/53101247190.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/tifazomipigusosiramuf.pdfIn PDF document text
    • 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 18420 bytes
SHA-256: dbd24318271193ca0103c6cb399fe5e339611e91e7ff4d9bdb4dc41ae2ecc104
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 10828 bytes
SHA-256: 48a147b528d5a4c51ee203f78b5ff70cc91b61ca1152c3a8deaed0ceca48d6af
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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