PDF malware analysis — malicious · 1cc56de87c129c49

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 18:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: e2211634fcb959f5608fa22226912c1d SHA-1: 0d6f86e0f2fbf3e1b00ee4bc8ac3698fcb894695 SHA-256: 1cc56de87c129c49fd24e47ee8c98fb5f8db1a52f22c3d3fe61e826678467a2e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve as lures to redirect users to phishing sites or download further malware, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=articulation+disorder+pdf PDF link annotation
- https://aduanaldelvalle.mx/userfiles/file/9751650057.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8a5bf773---57763533485.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tufrk6767opg3eq03ti605tume/8156127344.pdfIn PDF document text
- http://seasonsblinds.com/uploads/ckfinder/userfiles/files/duxozije.pdfIn PDF document text
- http://uptindia.com/newsimages/file///tegiligirisip.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0eb661b8f---pimesu.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4e30a3806a76634e89904fd30bb938fc/5782681040.pdfIn PDF document text
- http://apsencollege.org/test/fckeditor/file/refimozabewumaxukubidij.pdfIn PDF document text
- http://medizator.ru/ckfinder/userfiles/files/roxarusutavafuvuvo.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e0600c5b---22972630859.pdfIn PDF document text
- http://tochalco.com/uploads/files/wimaxulujugiditixa.pdfIn PDF document text
- https://wsbtitan.com/images/file/20985273318.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bccc1554a---86012464999.pdfIn PDF document text
- http://suriyedostlukdernegi.org/image/files/wigunobizewakumimuzazefe.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/lolijajilowopepifod.pdfIn PDF document text
- http://cuacuonductudong.com/upload/files/sawukesu.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127735205c5d---84951186534.pdfIn PDF document text
- https://bnbcostaverde.it/userfiles/file/70628125591.pdfIn PDF document text
- http://gianniarnaudo.com/userfiles/files/68807097197.pdfIn PDF document text
- https://www.luthier-auxerre.fr/ckfinder/userfiles/files/mepisatotipubavunuxave.pdfIn PDF document text
- http://forepic.com/_UploadFile/Images/file/pifezojefa.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1bniv9trvia0qafumpeip27ko7/53620394984.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/tifipusox.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f44e10f2939189e5c9c296ab997adca5/loleziriradejixefokakagel.pdfIn PDF document text
- http://ballmillfactory.com/d/files/lazitokupexot.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g0qfm5ucitllsdf0v6035ul786/31905037785.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_off0000ef00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF00	10692 bytes
SHA-256: `4badd0cfcef312101b455926804062dab3a5cad6105c9cd2970140a11bce457d`
`font_01_sfnt_off000107a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011fba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FBA	17256 bytes
SHA-256: `856f49e7e4b0830c718dbc9fca08337bb67c861e3d5671f5de5e43ab1423a22b`

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