PDF malware analysis — malicious · 491d8155334175de

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 04:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 84cd71fc59ec0fd73030338c773016a0 SHA-1: a2796e28488af6aa2941eb0cdccd25db9775bc32 SHA-256: 491d8155334175de0a4c4dab1c30c2342b36baedb5919bcfb17bfebc4aba0e2f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://pixomot.ru/uplcv?utm_term=disobedience+online+legendado PDF link annotation
- https://hnhaa.com/userfiles/tnejp/files/45815889150.pdfIn PDF document text
- https://mlmrockstars.com/ckfinder/userfiles/files/saliwakatogenobibalugev.pdfIn PDF document text
- http://goldenpeak.it/userfiles/files/55977655376.pdfIn PDF document text
- http://sozopolihills.com/userfiles/file/1238885751.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lm9l6kh47h0cl7s7hrfhd97im0/94055780697.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58223668792.pdfIn PDF document text
- http://edilcfcostruzioni.com/userfiles/files/71615622857.pdfIn PDF document text
- https://alrashed-alsaleh.com/userfiles/files/vuzefonogewajebevunerogo.pdfIn PDF document text
- http://salukool.ee/upload/userfiles/file/tajetepobenutezuna.pdfIn PDF document text
- http://x-site.by/upload/editor/files/49777971087.pdfIn PDF document text
- https://ecoverservice.be/gallery/file/74499244877.pdfIn PDF document text
- http://fructusartis.com/i/File/28930052126.pdfIn PDF document text
- http://connect-event.fr/ckfinder/userfiles/files/28975365579.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1249484ea---45512775308.pdfIn PDF document text
- https://planningpvedh.nl/ckfinder/userfiles/files/68041675071.pdfIn PDF document text
- http://telecycling.info/files/file/risonudirowanopumodoz.pdfIn PDF document text
- https://salvamontbihor.ro/app/webroot/files/userfiles/files/18328711218.pdfIn PDF document text
- http://kokocurry.gm/userfiles/file/weduv.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130306638e03---xekukewegelax.pdfIn PDF document text
- http://dichvutot99.com/webroot/img/files/wuxogiwonib.pdfIn PDF document text
- http://e-sheremet.com/img/suvolumawozazawekoge.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74f566881---topapel.pdfIn PDF document text
- https://officialbacknumber.org/editor_up/55899371415.pdfIn PDF document text
- http://vonschickenfremont.com/uploads/files/kulabejifusotopuxugikok.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_off0000da21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA21	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f233.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF233	17844 bytes
SHA-256: `8ced8d71dacff14bba503051c0674850014811eb02fbf6827497b113963f8dff`
`font_02_sfnt_off00012060.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12060	10488 bytes
SHA-256: `a64479c3c9fc299ca16a1d2b262503514af8e6549a9d8017937fe4547a7dee37`

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