PDF malware analysis — malicious · a75984957f9335f7

MALICIOUS

PDF

81.8 KB Created: 2021-07-04 03:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: be616c07ee6e9598853587c87ba59f44 SHA-1: 6eca140716dc49044b973b166a20d0771769f9e0 SHA-256: a75984957f9335f7a5dc482c598a625b9868d0d3ce9e746d1ff74e8f197d47e1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/upjtihcmqcdi0ikjvg3eh1n1h6/69257310751.pdf In PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac139ba9c0---xanizile.pdfIn PDF document text
- http://serextion2006.com/js/upload/files/fovubudutevusedujinipegit.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833c11b366d---56898220442.pdfIn PDF document text
- https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2d408fc80f057c91892a8d0ceb60c7f0/45441865320.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767389665e9---4437833238.pdfIn PDF document text
- http://zhongguohuachun.com/d/files/85307262386.pdfIn PDF document text
- http://postelezmasivu-brno.com/ckfinder/userfiles/files/40688149740.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a813b65b3---lozutim.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/wonerafamolisopabimav.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b76995c6d7b---fazet.pdfIn PDF document text
- https://dienlanhhonganh.com/images/pic/file/xitolinulebovupe.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/00551666cfa9b2f18fcf62fde47f0a03/lumitesunamumaxubokuxil.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e5480e2a---nezetomojobutu.pdfIn PDF document text
- http://headrepublic.pl/images/files/jilusafemoxalalir.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdeb6521f0---jifeposa.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cba9b0a2801---59126774476.pdfIn PDF document text
- http://artospace.com/pics/file/80315067984.pdfIn PDF document text
- http://haai.org/upload/file/17302386249.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1404ca9ad0f689b54bae273b0c0cd985/pewonuxewumenuke.pdfIn PDF document text
- http://sutinlawkrabi.com/ckfinder/userfiles/files/59294632423.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f547650b---tebumetonofalitadux.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/o3lprhsmqaul5v0li2g3ch7ada/7796080765.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8561417732---sasuviduvavonotobi.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a247bcd435---4189399304.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d35e1f36151b7fb060bdad7538885c54/70572251043.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cube+root+of+128+simplifiedPDF 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_off0000d64f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD64F	18580 bytes
SHA-256: `def875dcb67e5f17b6bf25545e2535f48acc1e5f5d7db82800aa620995bd2c32`
`font_01_sfnt_off00010810.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10810	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012027.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12027	11044 bytes
SHA-256: `f84401cee9ac628ba4924d88db379d28ed033374bf71a903950dc17399e2ed71`

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