Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5acc84d0e8f840…

MALICIOUS

PDF

88.6 KB Created: 2021-07-17 17:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c82baf6a18bfd563cec24eec60849b61 SHA-1: fbec65bd9a746b74c04cc3ec52daf3f3056dc11d SHA-256: 7e5acc84d0e8f8407eb7778598748285a029ad801ef4a92521184f33064c0069
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d58v2t53ar7si1ov1dl5e04l49/jutosijur.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210616_C45B5B67AEE1945B.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01da2c3439---fifabigonubabisib.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfbdca3d3---70058902023.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26d932cdb---81415961708.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc91e3ddb---77822859746.pdf
    • http://fasson.vip/images/editor/files/lifetij.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4b401fac---lufekuxazoxos.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d718b0d2e051571cef5056c98a278978/1622972045.pdf
    • http://cyuanmei.com/userfiles/file/vawonovid.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c93a0be3---71377278224.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cbca105de54c01db0ff3876680e93da8/22257536824.pdf
    • http://autobedrijvenindex.nl/images/uploads/tamurivesela.pdf
    • http://project-lovcen.me/userfiles/file/44746633587.pdf
    • https://aawyx.com/sites/default/imageuser/file/rudabuvafoxujowataf.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6310d911359338908b3ad906829731b2/33178221671.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9jve5af85bfdpehmm1vs0hg8a4/37830593745.pdf
    • https://bczenekar.hu/files/file/soramixalimatenitebasi.pdf
    • https://lymfologi.se/anvandarbilder/221/files/39042573579.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qsrhv32ficuidh5oaot6c4s1q0/wuxezotesitijarawunid.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16292120e---33368085370.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=top+10+comedy+movies+2020
    • 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_off0000fa7f.bin
0aa6cbc5bd18f238276f08464bd9c116fc36b0931605cbd2252996c2e85e8b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 10604 bytes
font_01_sfnt_off000112ce.bin
31bf2330178e83c749e016426917333d429c08287234a08b0043355be0e52b21
pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 16540 bytes
font_02_sfnt_off00013dbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 16792 bytes