PDF malware analysis — malicious · dd8c095cdeea73fc

MALICIOUS

PDF

83.1 KB Created: 2021-08-27 05:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 26f1c56c3ab3b9edc36198ab8476da5e SHA-1: 56d43270c91ba92863a2ed4af463e307db0ea474 SHA-256: dd8c095cdeea73fc505a5a57ef4fa440d0035faf5c7d8ced0c160c69c95ea923

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://coretry.ru/uplcv?utm_term=skinny+but+fat+face PDF link annotation
- http://gangwonbnb.com/FileData/ckfinder/files/20210815_FB1BC3C91B35497F.pdfIn PDF document text
- http://tsg-edinstvo.ru/userfiles/file/dabulukovisugaxakudatomav.pdfIn PDF document text
- https://safrano.pl/userfiles/file/tafubupibajov.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lvuntiu12291i9p7i139fbtp60/vujuwexefiw.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/427ce24cd77c8e4931bf1138e9bf7a6a/72193544488.pdfIn PDF document text
- http://apexibd.com/uploads/fck_uploads/file/kurazowiguxipososabavulu.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babcbeb4ca---batusit.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i2cglnmchjgh358bvossj949u5/wojoriluwenaw.pdfIn PDF document text
- https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81cc6c3199a7b8de5b102c1cf7564ad/30146328068.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b3d78958a---31759773034.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/98c25801d259c3f5671b78f5f37fca74/wajivosal.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f7115afa5---72422197936.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d50930af---79652653676.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/209ec32bc0360de395db61514cdb6adf/xaxavijinunusinagu.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f5b50117a6c9561824f60d7be403bfc0/kimirol.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/66857847759.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/sadusuleko.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160779662a504e---wojorabipik.pdfIn PDF document text
- https://clap-bas.com/userfiles/file/xeberelepibilunafisujabo.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9fda45bc5aba124644415ac9c332e61c/kofasepamifusibegaki.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/bipozokiw.pdfIn PDF document text
- http://ecogestval.com/userfiles/file/2173678592.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070204665cc7---fokemetonoratu.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e34aa4fb5---lobenowuvaruvilokab.pdfIn PDF document text
- http://wksystems.net/HotelEstimator/userfiles/file/boduvusobopoluzasike.pdfIn PDF document text
- https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24c8b2657---wudarilibajogeni.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_off0000e0c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0C7	10416 bytes
SHA-256: `d6368f7beaf5087662b037e6a2d92fe7b37fe957eb7351597eb5f5a89c33a396`
`font_01_sfnt_off0000f892.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF892	17120 bytes
SHA-256: `c04c87f55e41057d13a6749288235e12f6216db35dfeafe32f4c72bd63c89133`
`font_02_sfnt_off00012569.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12569	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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