PDF malware analysis — malicious · 1a04219feab3fcd3

MALICIOUS

PDF

86.8 KB Created: 2021-08-15 19:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: bb81f8dc9be1fa20d49e7fb44078f9ef SHA-1: 74cb3ae8e0ab19ef1b7aeea923480fb1c253869d SHA-256: 1a04219feab3fcd3e7e1df16bf58709ebc94cb7a791819dbcbea87f303dc663a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to lure users to external content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 5

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://csc010.com/userfiles/file/20210705065642_lyhgg5.pdf In PDF document text
- http://ingmontagna.com/userfiles/files/46840341895.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f15683c3---70298426417.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706668874fb---pukuratedife.pdfIn PDF document text
- http://dolphinkorea.com/files/files/18349919357.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/89ded56412ecf5dcc110fb3af85a5bde/gisokari.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/jadikuridevena.pdfIn PDF document text
- http://proxima-design.cz/files/file/46536048322.pdfIn PDF document text
- http://hersheyhigh1981.com/clients/37302/File/zovokonugikowabup.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c88d863e---65202642927.pdfIn PDF document text
- https://decoveinvestment.com/userfiles/file/12726513881.pdfIn PDF document text
- http://kirsanov-maslo.ru/uploads/vojodexedokovinibidewovi.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836dbf14dc3---noragiwidopuregavelu.pdfIn PDF document text
- https://b2cexpressdemo.com/userfiles/file/tisusisoduziroveko.pdfIn PDF document text
- http://alimentosldm.com/userfiles/file/78756865395.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b84b40967f---21552747863.pdfIn PDF document text
- http://dentistturkey.com/image/files/97047553769.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb0c8b7d4---tukogagu.pdfIn PDF document text
- http://good163.cn/Uploadfiles/files/sajifugowadufugotumexisif.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e49bdca3fae---75319232036.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/95479368089.pdfIn PDF document text
- http://jiin-torng.com/uploadfiles/20210808235000.pdfIn PDF document text
- https://alzubidi.com/userfiles/files/6581750517.pdfIn PDF document text
- https://nocenzura.space/web/img/podborky/files/2011127919.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/24190431727.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=biriyani+malayalam+movie+2021+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d8a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0B8	10860 bytes
SHA-256: `364aa5ed619b0479635baeabfc00310c46e386570f539c4094e35fec71ae2271`
`font_02_sfnt_off000109e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109E7	16448 bytes
SHA-256: `0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878`
`font_03_sfnt_off000120bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120BC	16932 bytes
SHA-256: `8f2fafc9393313c4b73006303eb7f1ff4cb6581154d6bac49115eb7f7f9a00a5`

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