PDF malware analysis — malicious · addbba240593b53c

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 23:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 012b1635a1e78af9b71dfbd19a017266 SHA-1: bbfd85d049a7f0ca16897b7ce94f03d5e9531dc3 SHA-256: addbba240593b53c8e02d8f389c3bd358da35ceb8c3b413daa880e1c34b30a1a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing or malware distribution sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5a87a33cc19d43a9ab57a0125d8efb1b/polapojage.pdf In PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608139bf0f345---31317457623.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f49379b18e995cae9bea1fac97cc4e68/9220833353.pdfIn PDF document text
- https://barcelonamedicalcenter.com/files/galeria/files/tonarugupulutemojez.pdfIn PDF document text
- http://riviera.az/userfiles/file/10355264402.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a1e698d3---dujerugedibo.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2387084c476426d6416f1a4c96f5a04b/35186059567.pdfIn PDF document text
- https://aordonez.com/images/contenidos/files/42944045351.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f3733818476b0ac373820343a104d1fe/nexedekijugodudagogado.pdfIn PDF document text
- http://americandeliorder.com/uploads/files/75654427444.pdfIn PDF document text
- http://alexhofford.com/temp/files/file/98347700424.pdfIn PDF document text
- http://kondicionery-krasnogorsk.ru/upload_picture/file/40354042925.pdfIn PDF document text
- https://fultoys.com/userfiles/pomumimulirotafuje.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/aa769d1c0b457b3655ed7a93e56e5baa/84580231479.pdfIn PDF document text
- https://nepalonlineexam.tisaracademy.com/userfiles/files/fesuvepokaliso.pdfIn PDF document text
- https://nothingbutsafetyglasses.com/userfiles/file/46645195734.pdfIn PDF document text
- http://studioambienteterritorio.it/userfiles/files/dakubuwosum.pdfIn PDF document text
- http://landia-print.com/pdir/file/77044992562.pdfIn PDF document text
- http://generaltubi.com/container/ckfiles/files/12969066966.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f75147242d5---21644919907.pdfIn PDF document text
- http://terezmisszio.eu/files/file/15287572745.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810edb120bb---20088441297.pdfIn PDF document text
- http://restokrat.info/userfiles/file/56570594510.pdfIn PDF document text
- http://www.dgtrans.co.th/login/ckfinder/userfiles/files/24316145594.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/nogoderonimijinesotenulud.pdfIn PDF document text
- http://namlongprojects.com/images/uploads/files/pijebimitavulisalamu.pdfIn PDF document text
- http://sugarfree-gelato.com/upload/file/8116663228.pdfIn PDF document text
- https://mldom.xyz/web/img/podborky/files/tokalibisuxibikeladero.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cambridge+global+english+learner%27s+book+6+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_off0000c72f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC72F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF46	11312 bytes
SHA-256: `7e61abd8ca7174f1de122961fe57d221006552949f8ccf1a2258b57670546991`
`font_02_sfnt_off0000f93c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF93C	18004 bytes
SHA-256: `7e8c53e09c845d3cd6756e9ab0e19822e05e9d809cbd7fc58d1e41b26dbba0c2`

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