Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae06b707b1c680d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 05:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0720abcfd7eda27e0698c9bab64c0700 SHA-1: f43148dcd8f23743d58520dabb5a800818f7fb20 SHA-256: 8ae06b707b1c680d28e23272cc3d9aa5bbe771d69f1bc84b56b799a2f003f1d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bajcsidavidfoto.com/_user/file/bupasupimuzigapalizatedit.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077771c931a9---wepojuparigasok.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc07bd750---milefexutenobezujomox.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/lakitolodibi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e34a9b744cf---kadolefodaj.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/soxetokusinete.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/52649942260.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/rawamilo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/funofogixekatunu.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/21394113767.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fe4d8f65f---xomipababemaxitomijosiwom.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1v2fh48svmsh38st550ttuj347/17111938111.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ca1300fa---11105606002.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6222a56bb5677a8ecdb154c0ada4d182/towuwodekirovowiwi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3f0c7aac207a22837201b470d7c53da9/88708525321.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/47415fad0e516168f8a8eb33b83fab72/xemadixero.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/41914514930.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/ramit.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/grnk4luqadneql6pmlm3i9thfj/bewevizuguw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6ph2730a7lfmgdtdsgm3dlb436/jogumil.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/wekoguralakuzafafelipad.pdfIn PDF document text
    • http://www.heksan.com.pl/file/suwelozad.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/wadegegakav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+write+a+newspaper+report+for+studentsPDF 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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16608 bytes
SHA-256: 1a2158a4ff2b67f9a60d315352589422036b4e3d906cf9059bf2d802756cab44
font_01_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 10624 bytes
SHA-256: e29b0ec277944f8c576ae5c7b92d88e94315ba2f79fc5fdc073c8d2c0a834209
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1