PDF malware analysis — malicious · 41d962af4ecf153d

MALICIOUS

PDF

95.1 KB Created: 2021-06-28 01:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: e67daf3087a338a63758cf360c7dd429 SHA-1: e1e8c4a082f8e8340afca5141d542f5dadcc26a9 SHA-256: 41d962af4ecf153d198bb8ff1abd449dfdceb7db9a2a1caf7ad40c86de49c9d8

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to download further payloads or visit phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://cructi.ru/uplcv?utm_term=standard+normal+loss+function+table PDF link annotation
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cbc828d3325592ffce529fccc4e71060/34591337481.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dbb85a9b---47896797606.pdfIn PDF document text
- http://activesolutionelectric.com/images/file/nanikibibopabasejiva.pdfIn PDF document text
- https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849379c00bf---63298760462.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fb3dd4669929264b3f0022711b2b1fc4/woliribalo.pdfIn PDF document text
- https://walkandsmile.com/userfiles/file/98872778847.pdfIn PDF document text
- https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/1341551267361b6ada3524778a59467a/50853690262.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160933cc8120f1---2217605855.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/p8md92782vgfhcsf7l03b0pdt5/rupit.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e7ec5ca7b8af41bfdae2969dfaa50a4a/29618708012.pdfIn PDF document text
- http://dalnoboy.org/data/filestorage/upload/files/betifunakokumagilopene.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e7d2ee41---nepolu.pdfIn PDF document text
- https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tojizaretizugidoreb.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n0p4vfjaefi6vejd67mlg1kttg/ruzed.pdfIn PDF document text
- https://webmenuplus.com/images/file/26081513891.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/769b1822936ccd9a1a35e9bbcc6a5d5a/debibiwozewikovoj.pdfIn PDF document text
- http://playitdirect.ca/ckfinder/uploadfiles/files/nojuwuzeduresigurezoxu.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d837071b18---pukuvaki.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e740853748---81642212325.pdfIn PDF document text
- http://arci-mp.fr/admin/File/woremeso.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c0778247ea0fc7133e323f1bb21c0bad/83312351906.pdfIn PDF document text
- https://iwistw.com/upload/files/41064526174.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f805c83c490103a516c6dba5a67095ac/jipagewawolegumodiv.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fff7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFF7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011804.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11804	2736 bytes
SHA-256: `f6e5f0d38c6eb52065291272ffe01dce830dc4d18e73609de5b8a8b1f3d53236`
`font_02_sfnt_off0001237e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1237E	18484 bytes
SHA-256: `d681c5e103732943ecc62a66183d03501813397ad6d740fa92eb944bc9091f8e`
`font_03_sfnt_off00015510.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15510	10952 bytes
SHA-256: `a557b52416c44d5b9d2f689ff40156d1736222c9a7e8571475e9380b7a332588`

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