PDF malware analysis — malicious · a5a1df0cd0b770f9

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 02:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 74fd205adf3197ca54a4c04a8e91fb5a SHA-1: 9c87199c4513b0c91c3ea422b08a24e5856d684d SHA-256: a5a1df0cd0b770f94fd4c9e8c2b9b2717a7ee9fa20e0e5c1b524201c0260ee15

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code within documents. Additionally, the file hosts a large number of external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://philabc.ru/uplcv?utm_term=five+year+old+bedtime PDF link annotation
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcd2da982---timepowoxi.pdfIn PDF document text
- http://dmscsmartlifeblog.com/userfiles/files/76354763860.pdfIn PDF document text
- http://atol-res.pl/uploads/file/5199740142.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/78207798856.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160999d730366d---nimonoma.pdfIn PDF document text
- http://phutungtdc.com/upload/files/nefas.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/44052167858.pdfIn PDF document text
- http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/mabajugafaxunitidewubobef.pdfIn PDF document text
- http://ahlhy.com/uploads/file/282031426676.pdfIn PDF document text
- http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/wonodexigalekulikisazu.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5d04a07a3---gonofa.pdfIn PDF document text
- http://rund.cz/UserFiles/File/bufujudefiw.pdfIn PDF document text
- https://paroles-vives.com/ckfinder/userfiles/files/87992700557.pdfIn PDF document text
- http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106190106071897728vcsor.pdfIn PDF document text
- http://straub-online.ch/userfiles/files/37412305289.pdfIn PDF document text
- http://birminghamseaholmclass63.com/clients/75362/File/31390664418.pdfIn PDF document text
- http://kovovyroba-nosniky.cz/UserFiles/File/xixizazivego.pdfIn PDF document text
- http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/wilugixopuleloxoziregobu.pdfIn PDF document text
- http://bycongroup.com/UserFiles/file/81351643395.pdfIn PDF document text
- http://simoncaulkin.com/images/wapuxamivufit.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e5c6faae6d9658185fd16476852731fe/42902091470.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i1etelhi8hq0iidfpfkhkvcdn2/jejegisona.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o9hk3v3n4go869thbrc7301fud/fosobexenukotogadosowuj.pdfIn PDF document text
- http://casier-a-bouteilles.com/file/23939978986.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_off0000c437.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC437	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC49	16348 bytes
SHA-256: `a1f2f1f4c6c9cda504af0edaa01d6290efbd38149464ae2fd0e95db8d01cecb8`
`font_02_sfnt_off0001066c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1066C	10432 bytes
SHA-256: `c26cd424623cfa7f1b61f8f9dccb3f4ea04d0a334b035d1669c82efa57ba20cd`

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