Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b380b18ebe4962…

MALICIOUS

PDF

91.2 KB Created: 2021-07-09 12:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49b248aade576eb1bb8204ab4a38cc42 SHA-1: fd4e6cdcfb6161aef35f2595973973207af3462d SHA-256: 76b380b18ebe4962173133bd7b2620629d5b42bd051caeaa39ffb10a9795df1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://archism.ru/uplcv?utm_term=how+many+layer+cakes+to+make+a+queen+size+quilt
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b914b51bc5d---3959222777.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38112c856---bipakelele.pdf
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/92872506886.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfd407cbe---rufirojorebodazototusakax.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/88828079308.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/rifunefonimukijuramuj.pdf
    • http://caffepontoni.com/uploads/file/44579245160.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a302dab55dd---lugagizosajuvawadovura.pdf
    • http://emailreceptionist.net/userfiles/file/guvujolurerexijuzimuxuna.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2omqe5tjgbah68m249vl8r82d8/90067177229.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aede5ccce9---nulired.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/6127863382.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e0f1f0c47e5c5a3aa2500b9d46ff3756/palazamuboluluferasowiba.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/44d7175b880d02f9e000c02feaa89bd2/jukijukuwike.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mlq05she7fcefrb91je7hh1ovr/poxizalasovepanitinuja.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/93319045108.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3461804---mubekadokanarodixupesefa.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1cd126cf3---2113710533.pdf
    • http://meadescafe.com/userfiles/file/maworanone.pdf
    • https://musikkursus.dk/userfiles/file/46113808211.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160986dc0b7f8e---watuzaponapiwakasugisuzum.pdf
    • http://pivotal-technologies.com/userfiles/file/rupifusiroxeluf.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/41b385b1ba9e7e4a06d90d73f679d141/fulusakifisesa.pdf
    • 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_off0000fd48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 16792 bytes
font_01_sfnt_off0001155a.bin
74e63fd65e8fe2520cfa0f8f635c6b0a73bddd5d3cfd30ab0dd0174bcc98d84f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 18264 bytes
font_02_sfnt_off0001458b.bin
9242b57d2d586c03e2ba47bef3c70fe768a7a2100b4350394ab844013eef14d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1458B 10980 bytes