Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0ac9d7fe6de2be…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 02:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25a1c7540756df3d7e97e0400e9837ab SHA-1: 2e67fe1c2174ca540fe9f0b53f457e3ad5924e41 SHA-256: 5c0ac9d7fe6de2bed9696a5c0dfd9131f14970c1695b9abaeaf42205162c823a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=golden+globe+this+is+us PDF link annotation
    • http://www.vandiestbrandstoffen.be/uploads/files/wixibofuvo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9cc234030---nujikimemakejanapajafu.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/89261978718.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/magabunato.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///93355355817.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0c19b61e2cbb0412d30245702e06fe8b/51224855189.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/funeruliruno.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/s8j3uu0p9prq6bb930vsqv0ns5/46807446083.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/67a0c3fd89c82ea8c491022e7f2c2029/nutuvano.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210624000752_ja4ugb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5b3ce0e3---81919268664.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/66721569187.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/04191307245.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/selirazarel.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da401be147---zukitasaziwu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/983b0f081be12aa795119efb16f0bb37/67763027626.pdfIn PDF document text
    • http://siembra.me/uploads/files/fefaluv.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f36a1cd88516fb050584d06ed27ecf0c/gaxitirodabigema.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/b2l84b2fb5jd7pq4ln7l9l7li5/80227453978.pdfIn PDF document text
    • https://kawanmto.info/contents//files/luwemifotosawiwesamisibud.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/35977260857.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10544 bytes
SHA-256: 0e32ef370e823ab629c9fa3525748f22ed1d46587a13f955b04c663f8ed6f293
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 18016 bytes
SHA-256: 85ce5fa0a652258bfd324a48230eddc703ce3153de2c48f2b83133f88768d030
font_02_sfnt_off00013e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1