PDF malware analysis — malicious · 451082970e0c442c

MALICIOUS

PDF

87.6 KB Created: 2021-08-09 17:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 26d4ee76d2507e57216cad6d3a4da8a0 SHA-1: 45c9254d97b0d45dee93c1a38708153198fd40e2 SHA-256: 451082970e0c442c149b3739bfdb1914bcc6d175caafa87a43cc71a3f82d45e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The document body is heavily obfuscated and contains no readable content, further suggesting a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=addition+and+subtraction+of+complex+numbers+worksheet+answers PDF link annotation
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kghgl6fhlq077ttn3j20gpjagu/50078655453.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160723ea7d6c0f---26187040035.pdfIn PDF document text
- http://zxpgw.com/userfiles/file/13838909073.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608690d8b18ae---1372043071.pdfIn PDF document text
- http://technocom.pl/editor/file/belufujananixisakemanaf.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446279c587---nogududopefifibunib.pdfIn PDF document text
- http://inciboya.com/resimler/site/files/zujewatorabexifuvorosoteb.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2cd9e9e1625dbdb58173cc6f8b6be6f/lipomumitiga.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d115237---lapilokofetutebegetuna.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2fa082c13c2ac0cdf623e97e0b0156c8/fesuxirik.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/61c1d54d32c3eaaf3f232c2a1848ff94/nukuverofatobijemokejebe.pdfIn PDF document text
- https://mimpishio1.com/contents//files/pududabosudozupufivuxer.pdfIn PDF document text
- https://djennebeads.com/nbloom/fckuploads/file/tezoxewukukugofeximozes.pdfIn PDF document text
- https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/zufatosefawugib.pdfIn PDF document text
- http://oroblupiscine.it/userfiles/files/bedet.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d82f78f41f9---80195161567.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c505b3551a---4862166189.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a91d2811---xetusupulafosedu.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0g3vib2aqr7hfnpmdlnna10qr7/setofidifufudexopi.pdfIn PDF document text
- http://hrzservices.com/uploadfiles/file/xaroz.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b788bf6a---41033490150.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77495f12c---44038121291.pdfIn PDF document text
- http://cartopack.com/Images/file/tazapu.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a618fb2b042---63454958476.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e17c60638aa---2282240290.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_off0000efca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFCA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107E1	11384 bytes
SHA-256: `f334530060eaee7059bbec845bbd51c19a59509065c5352e355e71601a4aed8f`
`font_02_sfnt_off0001226a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1226A	16484 bytes
SHA-256: `fc25409cacc8e6cb629a2225b7f584cbf9f492e59fd1166bc26c0ae26293dbb5`

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