PDF malware analysis — malicious · 38cd8e7407d9c484

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 13:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b6f43d2593b55b9a4c4713de46fd4a2a SHA-1: 0fbac5638fc63597bf4b5d1e643cd657704ea24e SHA-256: 38cd8e7407d9c484c3ad62ae92784073ddb0ebe02b88cf48c81ff00df85648e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=100+hadith+in+arabic+and+english+pdf PDF link annotation
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/32886ac5ae1f34db1ff7cc739f2a2d86/tupokodanakofox.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/ferekojufupupotakadagagar.pdfIn PDF document text
- https://kingwaterpure.com/ckfinder/userfiles/files/35593526648.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/93866807629.pdfIn PDF document text
- http://exhibitionchannel.com/upload/8227337611.pdfIn PDF document text
- http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/logawiv.pdfIn PDF document text
- https://laser123.com/geektic/files/67530460952.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5617c258b0---venexozutupilobaxet.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/43709598058.pdfIn PDF document text
- http://nissanotogovap.vn/uploads/images/files/xifavibotujeniruradibom.pdfIn PDF document text
- http://glastergroup.ru/userfiles/file/40100173846.pdfIn PDF document text
- https://elnativocoffee.com/silver/upload/files/96638929612.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/84607458755.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1b4b96bb6f0e757bba96af7509f143ff/sevejakotatugilagezik.pdfIn PDF document text
- https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a9be844d---47531932898.pdfIn PDF document text
- http://gyogytornasz.hu/editor_up/folezetumovini.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/30bbd3ade48d8b00c9eba1e028fce428/3742929901.pdfIn PDF document text
- https://gbagencement.fr/uploads/file/fudozidapemufeselukebulu.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1hgfe4lklgvt71tp8fi8o7cok/zewekepemuvovawaritikanig.pdfIn PDF document text
- http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/28789873449.pdfIn PDF document text
- http://assistance.uz/images/shared/file/927492326.pdfIn PDF document text
- http://serdceprirody.ru/userfiles/file/wokokesegowaribixof.pdfIn PDF document text
- https://telenovella-bg.com/files/28648462961.pdfIn PDF document text
- http://szentistvanpatika.hu/upload/file/tegizifobojokavifobufubix.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/91369447224.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_off0000c578.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC578	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD8A	22560 bytes
SHA-256: `a9d0bca90ad803bafc4ee48ba7ba2f310351d52b5fb966d1fa3c56f5b4f5d4a5`
`font_02_sfnt_off000117d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117D1	10996 bytes
SHA-256: `aa086aab6988480370415847581b06fc6f1db9e95eec7bd25e62041976ed1aae`

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