PDF malware analysis — malicious · 6cebb253fe4635d6

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 07:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 43eef9d367263da73ce05d809bebbca0 SHA-1: 0dab6f630fea8439f95bf0929cd2b4f41617cf34 SHA-256: 6cebb253fe4635d651da9db874d254a56b339d90d34b390b4eee6f0fb9171e65

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on potentially compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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 http://art-lan.ru/uploads/assets/file/vokomeru.pdf In PDF document text
- https://perfecthospital.org/ckfinder/userfiles/files/gasirekimup.pdfIn PDF document text
- http://zxpgw.com/userfiles/file/43892544020.pdfIn PDF document text
- https://sapsda.org/SapmaUserfiles/file/kegapasovizobitafetabaz.pdfIn PDF document text
- http://www.injamal.es/nueva/ckfinder/userfiles/files/5435820242.pdfIn PDF document text
- http://pibar.tw/uploads/files/202109030653407624.pdfIn PDF document text
- http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/dowedamabolevaluwas.pdfIn PDF document text
- http://kadet-ck.cz/pic/file/83375137937.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f88c8db37---85451345050.pdfIn PDF document text
- https://madeirashopping.com/userfiles/file/23941220040.pdfIn PDF document text
- http://farashimirooz.com/files/zisuvesagasaguredujebif.pdfIn PDF document text
- http://tinhdauvietnam.vn/upload/files/5418390923.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d86af114a---lejezoja.pdfIn PDF document text
- http://nut-shell.net/upload/files/lomufexokomoxabifuj.pdfIn PDF document text
- https://alpinashop.rudy-ra.com/files/woxafogibujaz.pdfIn PDF document text
- http://wsp.pl/userfiles/file/83933054937.pdfIn PDF document text
- http://scandinavia-ex.com/images/blog/file/68196423137.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/daror.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dce395472---44534252618.pdfIn PDF document text
- http://chromowane.com/userfiles/file/96346242838.pdfIn PDF document text
- http://hoanhaochemical.com/uploads/files/46534786614.pdfIn PDF document text
- http://lesbambousbleus.fr/ckeditor/upload/files/xusosaresere.pdfIn PDF document text
- https://indiantiffin4me.com/nbloom/fckuploads/file/poxijasawejevozexufaxunar.pdfIn PDF document text
- https://netkat.in/ckfinder/userfiles/files/45378182381.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d199aaf---7864839099.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=elite+music+player+mp3+player+apkPDF 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_off0000e135.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE135	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f947.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF947	19852 bytes
SHA-256: `e5a22abe7586ddeda61cf1305f57d0f4530cbfbd1c53fda61b484da58a7ed8c1`
`font_02_sfnt_off00012d8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D8E	10772 bytes
SHA-256: `e886a75ca435aea88f9dabdf6fe07e58231182e83b3af933e84f3285cc941660`

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