Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ed8f95d4f78fca…

MALICIOUS

PDF

102.5 KB Created: 2021-06-27 05:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15f2f5069d5801c5e78009af21063304 SHA-1: 82a0e1426989537962fae1ac91903104d4029a57 SHA-256: 57ed8f95d4f78fcac3717b61849e3a6bcfeef2989c6103e508d281dbab89e13a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://vietsaovang.com/uploads/userfiles/file/nejebasevunakonirediwim.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/15c36aa4ec7ffcd137e68ba4d6a93fea/pejub.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/kozosezelazejuxazafar.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/79325638041.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/rumifozora.pdfIn PDF document text
    • http://balone.net/_upload/file///99077831505.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815490bbd70---jidonipixekopafuwewivot.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9d59ed1605877d9baf2e7589121f793b/66982047025.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb7247ac1---kimemiwefumababe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3764ba6e---vevek.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/76bccb6a617214c929dc347e7152a6f4/kutumawujosurajal.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd205d6177---xubij.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d09911366db---52791099599.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216181452242139.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/60582d351229f4b4158db3240515400d/69522696416.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e398aa2e41---27382467878.pdfIn PDF document text
    • http://belst.by/upload/file/menenuxebuz.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/327397c62a71b8984700d39d3afa2d77/27900765138.pdfIn PDF document text
    • https://rajaunited.com/contents//files/34564635880.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/98387142932.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/i2c9jhkeoimr069u527b1arjfk/fenibubajamubutafi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a62beb689---47867343902.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7717629a---guvuwadagemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+disgusting+in+kannadaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 10568 bytes
SHA-256: db0780496b6ef801effa919214ea59d6ace42c44748e662cf2dc3ca4ea698d9f
font_01_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6C 16444 bytes
SHA-256: 6c244160f52c92e5489f29c685d41762c9378730777b3e3136567b3f721aa56f
font_03_sfnt_off00015418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15418 21536 bytes
SHA-256: d5e6552efa5deaa60b4d1faedf6c0b17ae4624a2f2b9f5414f8215d30a5b7c22

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