PDF malware analysis — malicious · e97e4cb747a49b6f

MALICIOUS

PDF

97.8 KB Created: 2021-09-03 15:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e514b666884b547eeee5f3bded36c241 SHA-1: e31cdbdfac300c0e6045917a50f32028c5a87827 SHA-256: e97e4cb747a49b6ff20529cc7f966529083921177cfb1734b39f78f63d1b05dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9169

Heuristics 6

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.
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://oaklandscreche.ie/userfiles/files/julavujidovufoniseru.pdf In PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7be23f898---watodafelozajimixudejo.pdfIn PDF document text
- https://vivekanandbawwa.com/userfiles/file/banisimidixipomefewafejuw.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc19635b3---86596604762.pdfIn PDF document text
- http://studiogiamberardino.it/userfiles/files/49685671340.pdfIn PDF document text
- https://vibangnhadat.com/uploads/files/77234802025.pdfIn PDF document text
- https://506hlapeta.com/files/file/44192808902.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02437a033---melemefexenox.pdfIn PDF document text
- http://daugiavanthienphuoc.com/media/ftp/file/5393129208.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jumubowutisuvan.pdfIn PDF document text
- http://instant-image.net/UserFiles/Site/File/fuwositudefogizovetapabig.pdfIn PDF document text
- http://dalnoboy.net/data/filestorage/upload/files/91131353855.pdfIn PDF document text
- https://mavibusiness.it/file/45724038960.pdfIn PDF document text
- http://interstyle.org/content/xuploadimages/file/94050308027.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/bopidetebutex.pdfIn PDF document text
- http://duocmyphamcongty.com/app/webroot/uploads/files/gelinakuwonotapilisuli.pdfIn PDF document text
- http://allgeology.ru/ckfinder/userfiles/files/rabolitixaguxefikasotoxag.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412de8abf4---zoxomikuko.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ad0f9a5fa658622e739dc432dc330741/2992562227.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/dozepadu.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/idlub72tct0h0vqlkrbpr4k040/52232969995.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160781a67135ca---dogezajibedefilevopepiw.pdfIn PDF document text
- http://atonoserver.com/userfiles/file/zejer.pdfIn PDF document text
- https://noddy.nu/images/file/75900202596.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075889cdf480---jolazelezezefofisenu.pdfIn PDF document text
- http://trendymamy.pl/userfiles/file/28645250316.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chuy%E1%BB%83n+file+word+sang+pdf+kh%C3%B4ng+cho+copyPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e04c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE04C	11604 bytes
SHA-256: `53b112c990cf4519d72a85f31d042154b33c92117d5869712180774685ac3a19`
`font_01_sfnt_off0000fb2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2A	1840 bytes
SHA-256: `e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729`
`font_02_sfnt_off000103cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103CD	27332 bytes
SHA-256: `0f7260c2af63807348be733b2c2d68e8c512375a58384e0f8aa15372251df41e`
`font_03_sfnt_off000147d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147D5	16368 bytes
SHA-256: `e154d936a41be88bac242e8baff4437d9de636e26742813f159a7c30adda26d2`
`font_04_sfnt_off00015e6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E6C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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