PDF malware analysis — malicious · e5230ce65f0807ab

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 23:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c98ab6689ee6c9d035c8fb15834ce331 SHA-1: f586e6f13a0726f06a1ff08a26d7befd77242327 SHA-256: e5230ce65f0807abb59052ffaacfac886ea9cf1aaba0837f166f28dad03316b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of external URI heuristics and the link farm structure suggest an attempt to lure users to malicious sites, potentially for exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/tikg6kq9t0kvoidlgikelvc2rf/92996325616.pdf In PDF document text
- http://ptaki.info/imgekoprojekty/files/54998019024.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0561eac8fb---golexobabofasisoduxa.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16114d6659d166---3324567532.pdfIn PDF document text
- https://tonwen.org/userfiles/file/nokemosomefesoreb.pdfIn PDF document text
- http://conelser.hu/fck_uploads/file/85828269421.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/14087947206.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dde40cf6b4f2122a1f8248b2eaaa8469/megodijebaw.pdfIn PDF document text
- http://thietkewebbacninh.com/webroot/img/files/58854649675.pdfIn PDF document text
- http://hosungtour.net/FileData/ckfinder/files/20210819_A4010DBADF7457BC.pdfIn PDF document text
- https://chris-arnold.com/userfiles/file/wilino.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/l4o0gc8rfe6qji5f74raj1gsu6/solesupunapav.pdfIn PDF document text
- http://fairtradeportal.pl/userfiles/file/16632015780.pdfIn PDF document text
- http://tecsun-moscow.ru/docs/file/pebitekijefoloxebewu.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0926d31cf7---65567530415.pdfIn PDF document text
- http://re-media.ru/foto/ck/files/62925002933.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ooj6c5t4toffll09bkft2b2oqk/44404177909.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9728d32969ddbc5ce283eeed3de8c4b8/wugesedo.pdfIn PDF document text
- http://sporteambiente.it/ckfinder/userfiles/files/fusejolimog.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b292cc13ce5---30011812607.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53d1eaf6e---97508345718.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d77b23d942f0bd87d83b58a0877f29ab/16714289456.pdfIn PDF document text
- http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1533073198.pdfIn PDF document text
- https://pmms-online.com/assets/file/fufasasilefibinabi.pdfIn PDF document text
- https://uleiuri.ro/userfiles/file/rebokagibimebug.pdfIn PDF document text
- https://reazfarah.com/ckfinder/userfiles/files/jegunixopigetivij.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o20998ohnj9gsirvp0kv1al6l3/45717734560.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+kite+runner+book+review+pdfPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e700.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE700	18388 bytes
SHA-256: `9f2379cac754eae0a1b30869cd1eab89cbe08cdfa6b48b493c970723a0930048`
`font_01_sfnt_off000116c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012ed8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED8	10668 bytes
SHA-256: `ddde4549903e17ef9e1e90bb5a49bb2ed9305339f316067a535ba68b1180edd7`

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