Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e5d0eafab88bb9…

MALICIOUS

PDF

72.6 KB Created: 2021-10-10 15:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 571c38d9135b654f077196c95f59e24f SHA-1: 2f4b4419bf308599941dd6265c2616ecec9308a9 SHA-256: 90e5d0eafab88bb975daa3aa83d74f2340169a355566df37fc2126bb41ae33ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous disposable domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://a-kamen.com/userfiles/file/famipipiriloduja.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/soraforaweta.pdf
    • https://songhong.info/userfiles/file/25484990881.pdf
    • http://aokisuper.com/ckfinder/userfiles/files/88414544915.pdf
    • http://superfasttv.com/uploads/files/wulejofaralu.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158351386f92---pinetedawilafilif.pdf
    • http://fapannimario.it/userfiles/files/jerilutij.pdf
    • https://globalcircle.club/userfiles/file/61338409097.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8a8e7cb9---63908076079.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160789475040---64778531898.pdf
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/dupebarelusoxirugubawajaw.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/10265860593.pdf
    • http://zabradli-znerezu.cz/userfiles/file/vigosudedebafol.pdf
    • http://recit-de-vie.fr/userfiles/file/marojibiwofefufozebufut.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/sudesonifinamimi.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/85696772817.pdf
    • http://miskolciharsona.hu/pictures/file/jugazejixigabakuw.pdf
    • http://cke.hk/userfiles/letesorirom.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/nonora.pdf
    • http://foto-recepty.sk/images/fotky/40411270467.pdf
    • https://ngonluathan.vn/images/ckeditor/files/desuwigurikirepe.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6dadeb3cfc6921a3ec10e93f9caf8e48/2388064743.pdf
    • http://kyanite.tv/userfiles/file/tosefukisigi.pdf
    • http://gugugroup.com/userfiles/dijujepa.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/3575376842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=commodity+price+inflation
    • 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_off0000bc40.bin
a5e4f6812f9ea837bd6a51188c864dae9507a68060fd5ad607720d9b8c655bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC40 10756 bytes
font_01_sfnt_off0000d501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 16792 bytes
font_02_sfnt_off0000ed13.bin
2810f9726e1a1d2b86df3ab123a2326ebe1d943148b5488232256f48181f10d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 15500 bytes