Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d729c6c268ff70…

MALICIOUS

PDF

75.7 KB Created: 2021-07-21 02:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 27aac229448afe97d60fb3f8b76fdde3 SHA-1: 19c1ea13c7c9f05a6972b3f0434ed5cf41e96419 SHA-256: e5d729c6c268ff705b764fe1ac52d4ddde40a015b3c692604739bcfecf270e5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute second-stage payloads or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/i5aeg042dbeh5k49gklj9rr70m/41468900085.pdf In PDF document text
    • https://conexkarvan.com/cache/fck_files/file/52273889314.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbb0829b7ef28ed9c98e7a45565c7b5f/74260814034.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080363602b10---juwoviwufimikadiken.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nigudafon.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/xanuxo.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/zotuf.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/89950100848.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/51995994790.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/tajeximuje.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608290a410318---55474838092.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/20945087136.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/92026b6603179cd3748c34a277d6abf8/51939838067.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/joxurid.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ckbmc5blc48b9lg112vtor37j2/83394271450.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ntvnmihr3ie5ep3ve08dehpael/18613957145.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c25931e4eae4fc5cf13750071821ea0d/48621274822.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db58960a7---80341670542.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/80022626735.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a0e35593714a93da72c35ae6f4f70bbd/54686480025.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca80af2a1d---wogizogepixugijenakilidi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074531544419---15646086443.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16085618731a70---18695617320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=greensboro+jail+rosterPDF 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_off0000c5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 16412 bytes
SHA-256: 441586e0307b33eba2e2a71d26b962a56871068e48c94bb8c4c9e6c01b9e5873
font_02_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10412 bytes
SHA-256: 8353d3a51c8a948e6d4796de239117862e630b8f525ea0db1a6cba1fce6e52f3

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