PDF malware analysis — malicious · ec19e21645c54f71

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 08:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 4d123dd64e83ef8d3cb1ff9ad7be49f7 SHA-1: 1e348caece938b3b9569ba9754924981a6b3f8c6 SHA-256: ec19e21645c54f7129008067c3af4627d5e75932b1bfddd9f0c30192f98d9ae7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content or visiting credential-harvesting pages.

Machine Learning

Nyx PDF Classifier malicious score 0.6801

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://irlanc.ru/uplcv?utm_term=introduction+to+electrodynamics+pdf PDF link annotation
- http://sportingfoundation.com/uploads/file/ragubovu.pdfIn PDF document text
- http://maginsaatmetal.com/resimlerfiles/84321790690.pdfIn PDF document text
- https://strategie-forex.com/ckfinder/userfiles/files/buwufixizuzakagutiwen.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kr3oa69ut6t9jg3vtn40r2s7qd/40396265096.pdfIn PDF document text
- http://tw-sincere.com/upfiles/editor/files/54875519823.pdfIn PDF document text
- http://belovosushi.ru/files/bemumesaf.pdfIn PDF document text
- http://silver1979.com/upload/file/gisiguwabu.pdfIn PDF document text
- https://hoongnau.com/upload/files/dufagodule.pdfIn PDF document text
- http://chiaranannini.com/userfiles/files/78365813348.pdfIn PDF document text
- https://szallas-karpatalja.net/upload/palemavejubizikax.pdfIn PDF document text
- http://union-montage.pl/userfiles/file/pavilitezuxofumup.pdfIn PDF document text
- http://mid-europe-ex.com/images/blog/file/3675701218.pdfIn PDF document text
- https://motodubai.com/uploaded_images/files/68031444979.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/62952852001.pdfIn PDF document text
- http://aapltd.net/userfiles/file/11965538802.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438ea92e6f9---mekometudafolivefotegami.pdfIn PDF document text
- http://euroear.eu/ckfinder/userfiles/files/46992993671.pdfIn PDF document text
- https://institut-arabe.org/ckfinder/userfiles/files/86534065114.pdfIn PDF document text
- http://bright-mineral.com/uploadfile/file/2021091406123687.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614819a5be7e6---kepifamagikedewinogukal.pdfIn PDF document text
- http://alacartedesign.de/userfiles/file/5537914057.pdfIn PDF document text
- https://pakistanchristiancongress.org/userfiles/file/64718998556.pdfIn 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_off0000b7b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7B7	10944 bytes
SHA-256: `e48adb97bac57244351033ee419d3c835735121aac8a0d15e8771042ada7af6e`
`font_01_sfnt_off0000d117.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD117	17420 bytes
SHA-256: `f8c9b61bc15fde2eda0154d82b35d576983cfb602a873dec065cfae7ea38ca93`
`font_02_sfnt_off0000fdf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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