Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fee51646638edd6…

MALICIOUS

PDF

73.0 KB Created: 2021-06-28 14:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b90d899523715d57598cdaf0120e585f SHA-1: 6da4cabccf014b4878def5c306a81fb4084dc382 SHA-256: 9fee51646638edd6d5f1c87132030cb1468cf4adb3db72d1464ea402d38b599b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://thedewakohchang.com/image/upload/File/8160264323.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ienhp9sb9070g1ee2lqke585nf/bonenuguga.pdf
    • http://tubietelbar.hu/uploadfile/wapopepixog.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e689eeab1c---rejalamajekezo.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0feb9731b97f6974a2720cc7b86a905b/52404599402.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/tmjc9ha6viohbd680paeqh3282/lebilo.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/80911417268.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cd766a24f51---remibeparupuzewegokik.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/88610dca142e2b43cdd7750c617d7273/nimukurura.pdf
    • http://hydrem.ru/images/file/galufa.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa716319f93ca62971b31e5f4c0b11e6/kexazikevawelosofega.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/48989bbfa22d91d4324be78cefc3323c/loduwomugiserurupiru.pdf
    • https://bakwanudang.com/contents//files/92372424655.pdf
    • https://ovth.ch/userfiles/files/17107953898.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/90sc8m61gfo2h3ssp28bcfvfhn/kibazapikezad.pdf
    • https://aljuboori.com/userfiles/files/volubawiwefeleva.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c7179ec9096f93d6f1474f77a56504f2/gitikifefinagav.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bd3ebad523736b1f456e2caf3016fb68/sufif.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e47637158---2512990764.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=all+marvel+movies+and+tv+shows+in+order
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD21 16792 bytes
font_01_sfnt_off0000d538.bin
e3d2787382f076750c62d0195b6bcb0f5c20ddf17e88547ff5dae64502884fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 10644 bytes
font_02_sfnt_off0000ed66.bin
dc35636e730ae1fe43f958190b8a3783374f2a98d07a3d7dbc250b33a069e8c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 16072 bytes