Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e590c03115060…

MALICIOUS

PDF

74.0 KB Created: 2021-06-26 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab768740b1264a12d8a93a13f75709dc SHA-1: 9aae8a8f24f98ad72f526694a8a9ede3b94e979e SHA-256: ff7e590c031150602c6f8f6f9ee0fd1e89e909617838faef6c608739b602cd3b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various compromised websites, indicating a link farm designed to redirect users. Heuristics suggest these links are used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/nsplaurfm3s42ls9r7s6617nk4/81108779803.pdf
    • http://talleresjpg.es/img/file/werimezixotewivuvobev.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b4bd246d556d05249a10cf34f5d70f16/57861854889.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ad16e2afe7b5c180fac6ce9fa7fac521/ninezemane.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081392adba5d---61036826747.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210605_1EA598AE5222747F.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609742fc25bad---44886247539.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/19l2oqh9sqhc1ai0tj25erqn6p/nujon.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e17ec35b9---jafaxumonuwun.pdf
    • http://arisutour.com/ckupload/files/40900494409.pdf
    • http://aaaexpressheating.com/userfiles/file/pirejoge.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddf31b4d9---kalumovekifunarekov.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160751bbc1fff9---93366679222.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/68429358912.pdf
    • http://ackerviewguesthouse.com/userfiles/file/10147138627.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e36d7426---gixusipuxoxozejodawexato.pdf
    • http://bawaconstructions.com/editorData/file/puwunikibamewo.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/028b9b4095e0040e76afff1981565503/tawasuvawamebo.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c199d879db2---24133841869.pdf
    • http://www.jindatunnel.com/up_files/file/97783741274.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef029fe73---fofazawotobuguvu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/41706f3c721d8683be9b56e84cda9db2/devinuzodidepe.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30482263fa7a6b5cceeae030c7aa387f/17985636230.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+animal+like+protists
    • 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_off0000c064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 16792 bytes
font_01_sfnt_off0000d876.bin
d74163165123130132e506d0251dd8d3ac165b82ee3e55d1be946922e00a8e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16512 bytes
font_02_sfnt_off000102cc.bin
2c43acf9f4a3e0726e8715dc4b004434707de869df13582a692908eb56d9e8b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 10604 bytes