Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f400083c3308a6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-23 22:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b6d09fbee05e39d7d309c0ff2dab251 SHA-1: b045d865c41aebdc1c34dabcb0c56c0c930327c4 SHA-256: b7f400083c3308a666d5d7835747d47de68e671ba13aca2c468f852ac7314d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://autoandtruckrepair.net/nbloom/fckuploads/file/dulimizozage.pdf In PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zerukusagalajogalalade.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330146c5a98---90672258496.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/77253440035.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/difaj.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/51521922467.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/22554249003.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e4e45feadde0ff2925c393f008d9b2d1/nipakupipowikenijo.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/81466220342.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/83006374889.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b47de2c18ede807058771a16a4ad4553/5169203890.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210908035240.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/tadamaxobomerupileg.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/budajan.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/julazuvizinumogeri.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f917e7ea5a8c060c395255f4345d6e4c/fuzoxejemete.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gimawajovavumijonuwime.pdfIn PDF document text
    • http://teresachild.com/upload/files/75684498973.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/15541601649.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/xologalogenosotosatumuji.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/38210853680.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/87512617712.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/42907426250.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/21377536222.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/12503979127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+joker123+apk+androidPDF 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_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 10772 bytes
SHA-256: 20cb766bfe2dbe9b57c101b46cb8b4d357d7c0cef3bedf252631017461314e6e
font_02_sfnt_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 14392 bytes
SHA-256: 6d19b506f7f3678481001a4516dc8542ce69e1924ba5e45442ea03371bc11f61

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