PDF malware analysis — malicious · bc04f55d5a5b61a8

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 18:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 85a36e0170a28fa202d086ae21aa7a57 SHA-1: 456c1c051a16359d911db7011ed7cbb814d73988 SHA-256: bc04f55d5a5b61a845a3828ba7b07d73b4347cb292a08e47c8e1bffa05642c6b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates a likely attempt to lure users to external, potentially malicious, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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=personality+development+books+in+english+pdf+free+download PDF link annotation
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0fd21925c---4495362077.pdfIn PDF document text
- https://red-adlay.com/upload/files/57158826379.pdfIn PDF document text
- http://icloudcleaners.com/uploads/account/autoresponderfiles/39381076338.pdfIn PDF document text
- http://kroonzuivel.nl/ckfinder/userfiles/files/belabizogepodogokujega.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/98868092e44cf57510f06c264f89302e/fuvupobedawoxiwelimujado.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2g7icsl0re8uepqspbkuj5fke7/gugiz.pdfIn PDF document text
- https://kcharp.com/ckfinder/userfiles/files/kobezumijes.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1eu8it7lucol0gkte9d5c18u77/5209944491.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/30901740243.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2f712c8b9d85cc68ac5b19471198d890/37702440691.pdfIn PDF document text
- https://bywuf.org/upload/editor/files/73893846813.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/34nkaemk8hm1m2j98uhgu2pgg7/88297582192.pdfIn PDF document text
- http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/kexatilasejosobuzal.pdfIn PDF document text
- https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/69825193707.pdfIn PDF document text
- https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d1ff89bce783b3c9691f7990b304f525/linibedefizidoxanuwasab.pdfIn PDF document text
- https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/k7uo6epufg7fii7amovem21nu2/17203542471.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/99422766638.pdfIn PDF document text
- http://railwaysrailroads.com/upload_files/files/49858042596.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e005226246---3424694632.pdfIn PDF document text
- http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/tifelugawi.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ff6a1654---tapujufi.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/82483556c1f7ce7577bd05b843adc004/gadevopeluwemituzasufad.pdfIn PDF document text
- http://mdfgiare.com/upload/files/33484856556.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/05211a3aafe314e4d55265f6fc79071e/62761712464.pdfIn PDF document text
- https://pjkconstruction.ca/images/file/34378608294.pdfIn PDF document text
- http://lpkgoodframeupvc.com/userfiles/files/74668043552.pdfIn PDF document text
- https://xlspandoek.nl/userfiles/file/mobarewudirisonagixe.pdfIn PDF document text
- http://amctop.com/board_data/editor_img/file/202105211413.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_off0000f34f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF34F	19904 bytes
SHA-256: `dcbbb7ed0dc262726484ca8250441f514b1dbb036990a0635980f908be5a2474`
`font_01_sfnt_off0001282c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1282C	11444 bytes
SHA-256: `50f6f52dbc621e66f5b07dcc13794e6ff684bd4ce39352d76515826c592fdfc1`
`font_02_sfnt_off000142ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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