Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1e6970f8288800…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 04:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd68bd2975c2091c288a9999c4c597a6 SHA-1: cceb45360ca87a87fe7e125c4073a5fdcc4ce306 SHA-256: dd1e6970f828880058c510a8a8fbbe0254083714058e400ae5a23d509e2fa0fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613715d136ba6---90103761000.pdf In PDF document text
    • http://rc-mst.com/mst/_upload/files/51886854340.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6ifh3va3mfr8oabqsse2kidr45/10676440969.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/divarukujir.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/9405996223.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/mulerubi.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/99274710722.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/64629501702.pdfIn PDF document text
    • http://e-hematologica.com/users/file/fabexabepugixiragaluve.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/wawubekituwidexeniro.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382eb074566---96044063559.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/zinoforilarizodi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/62402396785.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rojexajizujojubagafura.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/53465889161394ead74a74.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/1272815309.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/39508152211.pdfIn PDF document text
    • http://tid.vn/upload/files/49492778616.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/64128514347.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/64829402087.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/nelekujavejaj.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/zuropulujutarudimogegitu.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/deganebubusopegawog.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/35258553182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mini+militia+latest+modPDF 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 10300 bytes
SHA-256: 7c7ff33975b97624331ac3816fc072f211439a841528f12ee7dcc21973fc5ef5
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 18296 bytes
SHA-256: 3623785b531a87452668741eb528b12c3181296da4935b155dab9bcae08ff476
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1