Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efa03f594545d6a…

MALICIOUS

PDF

92.7 KB Created: 2021-06-28 10:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8e255abfa7f45977daac2db4a7ea6ee SHA-1: f6e4da975a2778f58ae5eee56dd99d7e871e6c70 SHA-256: 9efa03f594545d6ab5646f72ec69d22cac165622dc27b7c550fa2c4ff26c2efc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f84a21dc8d924f693e5256aeff4ad181/69999241029.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/panoxawufofinib.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4c38668f---2208173100.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f18f232cc1---3355992216.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/banafizorudawapepilet.pdf
    • https://grandegroup.net/files/62485124448.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf495ef69f---57332944930.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c5d95b4bd2456d0f6977812121502471/xekujimitokeparakopasewa.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/36c0526cf0b391b00e5d367de5d693e9/tiviwuvixasux.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c701cf97c---28853048588.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b373f4e3516---zixalawejakutupumi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f1ddc2e9---74114103188.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49caccda2---kojigowifubutalibexupil.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/fcb46c9d2a7cfa25f6758af8e6d0eff7/55478350592.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1da8c75c---9527470984.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4b1db8022991f9e594451f397a2ba9cc/53802816338.pdf
    • http://nadiadsa.org/userfiles/file/wijorivasisinaleminixak.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f7133100e187b255bfc5fbf19cdb79ab/87330642952.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4eb1aa50---30014023531.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12e4e6ff0---3114399182.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9df003dbd2a9e338a0f0536792aaa59b/mabusodaz.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/468f21c014ca620e6846b0d03f9bee1f/24375030250.pdf
    • https://anup.bo/images/files/fatel.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/varutugitufovexe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=latest+version+of+optifine
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c3.bin
bf51edff12eb6c1693ae5ef6cfb800808c1adab5c6d344968873cea565da98c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10328 bytes
font_01_sfnt_off00010a39.bin
e60748f1f907e8193e6fcecf50f42ef3eb6578043b3c2bbd757a54c6bf83c8c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 17220 bytes
font_02_sfnt_off00013719.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13719 16792 bytes
font_03_sfnt_off00014f2a.bin
b76b82c9c33c4ba4ffcaa0685249b9212319f4faf695538b132f6d753e0ce995
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 16252 bytes