PDF malware analysis — malicious · 6a19ecf1c3dd11a1

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 00:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 18aa1ae07def5bb860d67136de5abcc5 SHA-1: f87e20de679d6c74cd4d5c75856c77911d4211fb SHA-256: 6a19ecf1c3dd11a13ccb3443f8027918592127859e7b8c247b52d984323ea21b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm with numerous URLs, many hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=3dlut+mobile+apk+download PDF link annotation
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f545643b60---97490687238.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/susopikofugixupokukoridij.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb7081a85---zemadejodedemufokivaz.pdfIn PDF document text
- https://yumasri.com/assets/ckfinder/userfiles/files/vonakikud.pdfIn PDF document text
- http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/581f6693fb78108b969ef2f5375421a3/febexavakaniluguzovun.pdfIn PDF document text
- http://sportservistocik.cz/UserFiles/File/xizigixojolavedemet.pdfIn PDF document text
- http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/lunefujofuwajopalos.pdfIn PDF document text
- http://lamachine.nl/userfiles/file/vidakezugufiv.pdfIn PDF document text
- http://studioagm.it/userfiles/files/migewutigewuwele.pdfIn PDF document text
- https://dehayemek.net/upload/ckfinder/files/kufodapagobitoropujefije.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cafd1f7de---17652062978.pdfIn PDF document text
- http://chineseclothingonline.net/File/41930294477.pdfIn PDF document text
- http://jezirka-biobazeny.cz/UserFiles/File/nabud.pdfIn PDF document text
- http://hissekurban.com/resimler/files/vavidikezobabuxu.pdfIn PDF document text
- https://pearproperties.in/userfiles/file/tuvavekigegajobulup.pdfIn PDF document text
- http://syntra.pl/userfiles/file/vuxenixakexu.pdfIn PDF document text
- https://morganmethod.com/ci/userfiles/files/7622106562.pdfIn PDF document text
- http://studiotecniconuti.it/userfiles/files/gegisiko.pdfIn PDF document text
- http://dgxzz.com/uploadfile/file/49499686411.pdfIn PDF document text
- http://tion.hu/upload/file/bolabevesamojivokilov.pdfIn PDF document text
- http://lhdrum.com/User_File/UpFile/file/20210908224923_YnVzb3Rpbmlsb3dva2lrYXZpbg==.pdfIn PDF document text
- https://paulogomeslda.com/userfiles/file/xuxozofobijoluwajekafu.pdfIn PDF document text
- https://bienenaktuell.com/sites/bienenaktuell.com/files/file/94051847707.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_off0000d4e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4E5	10776 bytes
SHA-256: `02d8bf5ef81d7b1650bf8bfbed7985c341d2658290612297af7e14d361cbd98b`
`font_01_sfnt_off0000ed77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010589.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10589	18556 bytes
SHA-256: `fdb379629ce6347db7e02ea45f4a2a20ba6f14ab772c902da47e6069558a117a`

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