PDF malware analysis — malicious · ed2b9385b334a2db

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 02:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 8c6d806ba37ab32bbdd57b5803007e51 SHA-1: 04f73b9b88ba4dc560e09c135f30b798d91d93a9 SHA-256: ed2b9385b334a2dbfe93dc81971cc5f5ee7b7a7d60a8910634d4c10324ce11d7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs indicate it is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=operating+system+bca+pdf+download PDF link annotation
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8fdac1bd---96632017059.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f113090---50771641611.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b88758c80b7e11e968b527b4bb70878f/nafujeja.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/taj8sa4sg9jv5rmpq8kqnkp3fq/naparoxilawufitulemuzaju.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c103eb247ea---56162161445.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086764e846a0---fibejidufasesono.pdfIn PDF document text
- https://die-elke.de/cms/elke_page_files/file/pexatupopalov.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee937b9c1---49174116470.pdfIn PDF document text
- http://on-video.com/movies/movie_data/file/1268357838.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9b105202067bafd29aa2bf90b8f41795/jabafuxelizife.pdfIn PDF document text
- http://aucoindeshalles.com/menu/file/69426339927.pdfIn PDF document text
- https://alibabaoman.com/basefile/alibabaomancom/files/86914172386.pdfIn PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/046d85ee0ea88e41c2b7472251288627/fepisupu.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160887b5a6174f---jugajobobokuga.pdfIn PDF document text
- http://cn-junsheng.com/upload/file///202162318439195.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/7v11nmepoqq04kq3hr3r29ou34/kirubosuvaw.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/75b2d00a1ac68b8801aaa72bca03673e/jumevaxawov.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607717dcc2cff---penot.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/jep6cpcqafjsgn957g026hfdkb/mopozudanibepe.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c6f6e8ad---jajos.pdfIn PDF document text
- https://altonika.pro/files/fck/file/fisulutusuzidadusi.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a87227f59---12796766977.pdfIn PDF document text
- http://technoculture.cz/admin/upload/file/wepow.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef563dda2---84145929937.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefdd53243---24636995537.pdfIn PDF document text
- http://closehorses.com/userfiles/file/87355087660.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_off0000f21f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF21F	17036 bytes
SHA-256: `74335a2db5333467b0246ecfee6906e32f203389308a17608b8f668ee75fc8ec`
`font_01_sfnt_off00011e88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E88	11328 bytes
SHA-256: `7614bf252ecab2b364b38ebf9a000c97d2181a65a971ae4c75a09ec49f45ac8f`
`font_02_sfnt_off000138de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138DE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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