Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2be3528ae555afb…

MALICIOUS

PDF

83.6 KB Created: 2021-08-14 15:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e19fa1a6eb1f1b9f3d9216b629e7c346 SHA-1: 889e89352b4a2076c13ffe1cc250194c6e67ce2e SHA-256: d2be3528ae555afb23ac9167d812bf5ee7675a406655db5a0304407c914edfa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing sites. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kjeuqh1h86ne0ek4okt288qucs/96836871779.pdf
    • http://longthinhphat.net/uploads/files/46740510104.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/76996604671.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/87663867310.pdf
    • http://cochu.net/resimler/files/8669096813.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/51f658b587a6bfb1042ea774f3656308/34820931196.pdf
    • http://elektro-galerie-hamburg.de/userfiles/file/fekapegebasapawok.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9dca7bd81e8fb45e1a2af10e76490843/peluf.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/8029572130.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/09didof0poo0i4a2dmeufgkeue/volepetelididedaxilavoj.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/efvf94isj344a1oa31f02c6050/poduxisilarawuz.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/duzuxemevuvonuda.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/86432676687.pdf
    • http://zhengfutz.com/v15/Upload/file/202152432109111.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d6126990---wajamedanopopesukotekusow.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c66948c6a9---fofuf.pdf
    • https://muguet.fr/sites/default/files/file/72784925131.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64cd2ce64---44599350566.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8d056c5b---kajos.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mhe72puoic0h0jkum1njdth121/97138603765.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbaa46549---boxosaposenutabapuwixezi.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fb80a85d5a768a20c611ab4ceab633c8/jepovato.pdf
    • http://limeitec.com/upfiles/editor/files/84040602939.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd81bd617---15128111431.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=12000+pound+badland+winch+parts
    • 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_off0000e082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16792 bytes
font_01_sfnt_off0000f899.bin
bf274050f3fcadcedee277eb5c8edc0e232affbba90de4475514371ae6799378
pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 11004 bytes
font_02_sfnt_off000111f1.bin
d5d5fecb180e54d9b73813bc10d56444326019a187103f18b92737a1a8651240
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 17340 bytes