PDF malware analysis — malicious · 211fee82551d3af8

MALICIOUS

PDF

85.5 KB Created: 2021-08-26 11:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 261c24b0060ede28fd4ac71162dc57ba SHA-1: d8208543130b8ae54d1f70e0894ccd4e6d86e299 SHA-256: 211fee82551d3af8eed2c1a9c12392502636ae6570efff9059397664e9a1115b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

Heuristics 7

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.
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 http://elsekmont.eu/userfiles/file/vepomidulusos.pdf In PDF document text
- https://apexsafetyproducts.com/ckfinder/userfiles/files/zerodavekatipiw.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a4a558a80e7fff6e001fe6fcf66ebb7e/sovitoxajuxuwexunot.pdfIn PDF document text
- http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sebusoxumotozap.pdfIn PDF document text
- http://centronegozi.com/public/95832399722.pdfIn PDF document text
- https://confeccionesruiz.cl/UserFiles/File/pivuvewaxegumef.pdfIn PDF document text
- https://ktmcollege.org/public_html/userfiles/file/bumonoviriso.pdfIn PDF document text
- http://greenlivinggarden.com/htdocs/UserFiles/file/43077611600.pdfIn PDF document text
- http://www.solarwindependence.com/ckfinder/userfiles/files/zigugo.pdfIn PDF document text
- http://galsabino.it/userfiles/files/rerazeboloxew.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb5825dd62a149be02fb0015f307f5e0/33014529904.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/37230736538.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/et4v7bpr14vrt9s70mplb7jes0/bazurulat.pdfIn PDF document text
- http://geo-equipe.it/userfiles/files/95021593619.pdfIn PDF document text
- https://travelsafeway.com/userfiles/file/niledagosipetabipekira.pdfIn PDF document text
- http://divorcefinance.nl/uploads//file/kibekozajirorudedaf.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb852ffb2---96238466945.pdfIn PDF document text
- http://apartmaji-zunicmile.com/uporabnik/file/kegol.pdfIn PDF document text
- http://onsijsselstein.nl/userfiles/files/rerilolel.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ed30cb55d4a---60882864956.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed0bc2ac7---pisoso.pdfIn PDF document text
- http://www.humillacionyestrella.org/ckfinder/userfiles/files/80802687354.pdfIn PDF document text
- http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/sixanir.pdfIn PDF document text
- https://weboonline.com/ckfinder/userfiles/files/sasip.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d5096620f2c7adcffc551d2d32503c07/xosemanurunirigemarilosel.pdfIn PDF document text
- https://coolinterier.sk/upload/files/movoxunik.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a961ff78e86---25651542776.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tamil+monthly+calender+2020PDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d48c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD48C	16548 bytes
SHA-256: `f820a3dba0848292e883aff1815eb14cb1e6bdecf13eb2f6161e9a0bb8c168d7`
`font_01_sfnt_off0000ffa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFA8	10788 bytes
SHA-256: `5046a5245d37175a31e103b9be8f2db2c5a3fbea3d905729fc68c053fbafb191`
`font_02_sfnt_off00011857.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11857	16092 bytes
SHA-256: `9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd`
`font_03_sfnt_off00012d9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D9C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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