PDF malware analysis — malicious · 1dc79bf4087f0bb7

MALICIOUS

PDF

89.2 KB Created: 2021-08-26 01:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ead02b44b7f18636770af41be2aca579 SHA-1: 040fb248fe5343dda7aa48a7692b82164a62da0b SHA-256: 1dc79bf4087f0bb7cedf08e31838d96979d0e1064ae9dd3a62f1fec367de0c06

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are indicative of a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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://archism.ru/uplcv?utm_term=allstate+smart+student+discount PDF link annotation
- http://sharon-barron.com/userfiles/files/74103738009.pdfIn PDF document text
- http://www.tomasjelinek.com/img/pub/file/vumifogada.pdfIn PDF document text
- https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608910fc2ffe1---juxofarizit.pdfIn PDF document text
- http://lulanjina.net/upload/files/lavawejipoxofavu.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b037c8e3bb5---32857142365.pdfIn PDF document text
- http://branpc.in/ckfinder/userfiles/files/43190236255.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0841fcc2cbeb856cc53e2b3c9e6aef2d/57916199585.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9ed4005ee30395c44f09edca658f3c8c/nepisomumatokeku.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4ce2b1bf---11325812446.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/822c48748f0ee604f436b27cd344111c/luvefit.pdfIn PDF document text
- http://likuidart.com/files/ckeditor/files/dozimikuxawir.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bc615cda3aabec4ecd87c6d150b2f62a/14276740704.pdfIn PDF document text
- https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/dagokorurivonaluvaxisufip.pdfIn PDF document text
- https://activepymes.com/pub/file/73279771231.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4ba94a1e---71800488610.pdfIn PDF document text
- http://peneleos.pl/userfiles/file/dugewijezogapogewo.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01d140421---wajelulabevugojuxonapewiz.pdfIn PDF document text
- https://hoangvan.vn/wp-content/uploads/files/besokijujofesetu.pdfIn PDF document text
- https://xn--interpeas-r6a.es/upload/files/16789428880.pdfIn PDF document text
- https://sardavetri.it/userfiles/file/90257046800.pdfIn PDF document text
- http://happysmilecard.com/uploads/files/10766394283.pdfIn PDF document text
- http://thecargonepal.com/userfiles/file/sibetujedevotapewerixike.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/74b7b46c6af3fdb83cd5791cda38265a/xokodulevoxufimitit.pdfIn PDF document text
- https://sardavetri.it/userfiles/file/razunu.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f3955cb186ccdf1f2fee9d5e27df7c57/85846164499.pdfIn PDF document text
- http://wych123.com/upload/files/39680098059.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e455.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE455	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC66	16232 bytes
SHA-256: `bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d`
`font_02_sfnt_off00011249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11249	10612 bytes
SHA-256: `ff071d4dcd62e49a95d755b8cd1e96c1a83a0d437089e1d2c59ef4d3ad65ac21`
`font_03_sfnt_off00012a86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A86	16632 bytes
SHA-256: `61f98be11afc5f7c517d659c375a7014bd23da4947f0d939a28ed9141a510836`

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