PDF malware analysis — malicious · 82e250406b41b897

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b93c30209c2bdce87d0b6d4b5fa59e91 SHA-1: fba7e8ffbc0ffdbf5f96d2c151e183fee42439e7 SHA-256: 82e250406b41b897fb810fdd5571b355a99073d2580a93e6a2fd8111aa96804a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous external URIs and links to compromised CMS uploads, suggesting it is designed to redirect users to malicious sites. The presence of embedded URLs and link farm heuristics points towards an attempt to distribute malware or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=roman+numeral+worksheets+grade+3 PDF link annotation
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bd9dc8be72582af57b582bb9f2dbe2fb/2685749605.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129a5cccf4---66491423910.pdfIn PDF document text
- http://domainecomps.com/documents/files/bovemotawofuzejagatipubu.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601bbc2754---96436478321.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/48ecb38f8778ddb4ad8d0709a152226c/42714773285.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160add383c3971---73582656108.pdfIn PDF document text
- http://studiotrusso.it/userfiles/files/lixupetokageniweru.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb5282d15---guluzuwivo.pdfIn PDF document text
- https://sanipacific.com/attachment/file/80043451170.pdfIn PDF document text
- https://przyklejki.pl/userfiles/548963536.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609741cf286b2---30701106187.pdfIn PDF document text
- http://rococosofa.com/files/files/15174989752.pdfIn PDF document text
- https://rlmahtani.com/userfiles/files/bumezirawizifesesexuxedik.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607330f544d11---67396046179.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a0d0rv5p4a544a8rqbha5u3ug6/paburuvovepato.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fda643e5aa646a3495ed0707e0a5903a/sakipegepafesisosobizob.pdfIn PDF document text
- http://kaymccarthy.com/immagini/file/11469401392.pdfIn PDF document text
- http://angelojrobles.com/admin_initial_test/userfiles/file/43746134742.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mh8mj800oem39r0lsom48poh6m/tepodalirofiduvazujisuto.pdfIn PDF document text
- https://cooperspick.com/files/sewinakafirafababosasoj.pdfIn PDF document text
- https://ixiu-23.com/uploads/files/202108170453539233.pdfIn PDF document text
- http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/moxedurokewagoneweba.pdfIn PDF document text
- https://hotellemaritime.com/hotel/upload/files/ludeponinesomobuzuge.pdfIn PDF document text
- http://www.astmalek.cz/obrazky/file/lesesijo.pdfIn PDF document text
- http://primeasset.hu/fileok/file/42809290518.pdfIn PDF document text
- http://reginahajo.hu/_user/file/zimipa.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_off0000c23f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC23F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA56	11096 bytes
SHA-256: `5db17ea0594ddb3cffc37aeea30f16080bb3657165f92ba901a564bc953b2b5e`
`font_02_sfnt_off0000f3f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3F8	16748 bytes
SHA-256: `fa24d7c2d29a96a1b89127241a68d87a7e68f3a2084e8247e1b4001576944075`

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