PDF malware analysis — malicious · 7567d21b963288b9

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 01:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 597ddc5a7a2e05f3d129cbc2a25a915f SHA-1: 9d9bfcf30be5b645b27fb39fe36489967bba95df SHA-256: 7567d21b963288b93d902e9f4028db9233421c5e0b8f9bad5d4f06f39659cccf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://korvet-sp.ru/userfiles/file/buvulenusuzij.pdf In PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hr08k4akqqkslh162m71fn6n5/gogewedemutazetipu.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/38424896618.pdfIn PDF document text
- http://amblesidewindermere.ca/fckuploads/images/file/49480901535.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b291a4af4a4---vibiteze.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3t40il2vp0s78skps0vp1l1avb/lilesezavepul.pdfIn PDF document text
- http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/jf38q56plu6ejn1ho54s809hbi/raged.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/dd0b453d01397b195b946ef5327b7a59/bozilakebazikomu.pdfIn PDF document text
- https://vresponse.net/userfiles/file/64797537653.pdfIn PDF document text
- http://yuanhebiotech.com/upload/files/wadidevidozadixuwegis.pdfIn PDF document text
- https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/7056626215c80cee8ba82459b2de237b/jumivakodozixane.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0l59gv6tsonat4n81aa45u04e5/rovapuwoturapifakepet.pdfIn PDF document text
- https://hideab.se/tc/Mediagalleri/file/5925227629.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3766f287---verojejogozozajagisipa.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfdfa6874---29889190881.pdfIn PDF document text
- https://cochleartudaskozpont.hu/files/zizawafavasujafazobaji.pdfIn PDF document text
- http://doudou.tw/userfiles/files/momuxetakajuvad.pdfIn PDF document text
- https://swalaya.in/userfiles/file/59937049603.pdfIn PDF document text
- http://didocrosby.com/imagenes/file/486791945.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/44779918703.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fba16b40203ab7a56cc4cc8242546857/28687427062.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838ca35ca07---7185829599.pdfIn PDF document text
- https://premiersuli.hu/files/files/12578469.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa8ef0984---8946131494.pdfIn PDF document text
- https://bjjewels.net/nbloom/fckuploads/file/wesujokezol.pdfIn PDF document text
- http://studioboscono.it/userfiles/files/67836165631.pdfIn PDF document text
- http://consulcongress.it/uploads/assets/file/3874877980.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+emerald+pokedex+pdfPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e7f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7F8	10496 bytes
SHA-256: `979d7a36406ceec16d3b909410bf8175df1071bea8c509c9b96743eae5486c48`
`font_01_sfnt_off0000ffc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFC6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000117d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117D8	18172 bytes
SHA-256: `aa5e9d2f7d3c2fddc7ea82f60085055f25d8d5ab91fefcf3e3f09aeca1ef6a34`

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