Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d23702fdf9a37cf…

MALICIOUS

PDF

82.9 KB Created: 2021-08-29 06:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8eac1db9a59bccc809559cde45dba509 SHA-1: b93c96c83a6024410424810e9a39dc00d1c8b214 SHA-256: 2d23702fdf9a37cfa1fbff43d048c1ceb082a96a7ce40ace0979fcd1172a9eb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f89f4858d85c28673e9d6f823ce718db/90260049330.pdf In PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/ferugoguxesag.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/57032975819.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/98991453823.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/55610162028.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/xikolaz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c1278c33fc9e030b35d7d22e5b1e5252/lufatuxubikifatamete.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60440513106.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/cf212ff37c69c79f13640bfdd8dccafd/86895866447.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/ponagevogiza.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e461c7e79458cba70466623818970dc2/tuwajemama.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607926707a247---1606071081.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kufogepudafukiv.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dojawofotepakedubatesit.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/sewekusipizabamogomiri.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/34507520528.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/toramuzato.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f4bd82986---45758991683.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/terewowigoziza.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/kixibitinu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d500878d1---buzaru.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/76643556977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+penetration+testing+pdfPDF 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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 19148 bytes
SHA-256: 5246ca4334a05f4bd65c510d0439cf2900e7f258fe0cab8a87d3da7a39473c22
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 10608 bytes
SHA-256: 3414f17790e407a400c1827b5cd675cca5515881bef6917007d7e14a5a43bc81

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