Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfba2f67f74a0ea…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 15:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 264f84a8cdef8539b876a5aeb34e2b83 SHA-1: 17ed0a69687950b764dc184ce8c270eb56a3cfa7 SHA-256: dbfba2f67f74a0eae68a7d75baf6c69a6d79aede22d4e62fe08e9fc8ef483519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to obscure the ultimate destination or purpose of the links. While no scripts were explicitly extracted, the presence of numerous external links strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=loopz+pro+apk PDF link annotation
    • http://ymmicro.com/files/files/jodilo.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/30497858078.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/210906201754501587umyml7y4vcfn.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/gufik.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/gijutekebavibubak.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/52689326991.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/41549340999.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/64081638641.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9cae48a4---burigopalozewupuvugenifi.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/feveneziluzi.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/25198309380.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/bawevunusozegetezivat.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138254eddec8---30841794928.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/mowuzusimix.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/54472858186.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/27219323832.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/42060880356.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/falomorapufugu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bec7e4c74---97551963833.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/63889952143.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/76f095ba682c896ba824a79c41b99bd2/getesujawasotowiwafanuxe.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d92d64a02efa0e389d89d10bd3e0a35a/65161317443.pdfIn PDF document text
    • http://thegioioto.store/upload/files/55528329683.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/fezuximizigenesasuwawejo.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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 17592 bytes
SHA-256: 9a1712d28521fcc1fe34a771c8a434fa36fa953e8ecf7272a0edf4bd46bb7f6c
font_01_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 9712 bytes
SHA-256: 219d1929909a7688e7744b8e2548cb5e77ced1899a1d51f0fe98b3cab44c08c4

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