PDF malware analysis — malicious · e4c3d82d070c675f

MALICIOUS

PDF

82.3 KB Created: 2021-06-28 23:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 221b5d631e65d1fbf169c54dcda1ed1b SHA-1: a9171216b8032db409149330dc56db28e6e81e05 SHA-256: e4c3d82d070c675f61002ebf33f3aae1f6ada1671572aea2de4a4d0001f179db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic indicate a strong intent to leverage these links for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=use+a+an+the+worksheet PDF link annotation
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1738b03---59196639659.pdfIn PDF document text
- https://alate.org/admin/fckeditor/editorfile/dozalizamiv.pdfIn PDF document text
- http://zimmerei-possert.at/zuzidobasepi.pdfIn PDF document text
- http://myxroad.com/upload/userfiles/file///fepusomozego.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c759026821cab1455daf48521226652d/27246571761.pdfIn PDF document text
- https://pcstaiwan.com/ckfinder/userfiles/files/jukukegowedaruki.pdfIn PDF document text
- http://poolprotektor.com/userfiles/file/54913375316.pdfIn PDF document text
- http://brightwayconsultancyservices.com/userfiles/file/sefupezapexulinewi.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a9708800---rozomaxakexanetikeresu.pdfIn PDF document text
- http://remont-elektro.eu/archiv/file/xejinavuwokobarogur.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vkvovm7heqlkb2u1ubvre9gped/denuwemugerejixabokazit.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qfqoir8168gd806vujkdadd05j/kurun.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7776ca2---99550580865.pdfIn PDF document text
- http://hydrem.ru/images/file/sejawabowagipijamupaj.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ca39cfcab---lovatagowuxom.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5130cea71e30c6c59cbe6b423d768dad/31509073285.pdfIn PDF document text
- http://abogarestudio.com/userfiles/file/befujajigemoxukip.pdfIn PDF document text
- http://mosjob.ru/images/file/40228209282.pdfIn PDF document text
- https://optimuselearningschool.com/learning/site/images/uploadfiles/bajavunekobuvodixeri.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdd146668---sexumevuritasuzelibena.pdfIn PDF document text
- https://villanakarin.com/userfiles/files/4656396047.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b430bd20a6ef6a000a7e01e7d7baa59a/kolabifimebetij.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ff936a14---96371253983.pdfIn PDF document text
- http://trunglam.vn/uploads/userfiles/file/45770028891.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5ac649213768315d6680712045abd407/68753789142.pdfIn PDF document text
- http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/xitimus.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000df87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f79e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF79E	10252 bytes
SHA-256: `a681812a6c1470832c25ff6dc2aa3b2e19b52e96b8ee6314fdcec49b5e2d2a6e`
`font_02_sfnt_off00010eb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EB5	16864 bytes
SHA-256: `3b427cbac810d1813bebd9c9335d20a5d5a706da49c4a121c83c5a803535e3fe`

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