PDF malware analysis — malicious · 3e0f0d8d72eb05a3

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 01:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e1c2b357fa8443eb9e5248d46feacb96 SHA-1: 01e07ffb5da5b3f459e1a41b1e6a58ab5865189e SHA-256: 3e0f0d8d72eb05a37784f9bf2a49374e6dfe72306eb1e3fd5aefaa1135cdc33c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=mean+median+mode+sample+problems+with+solutions PDF link annotation
- https://laatjehuisweerstralen.nl/upload/file/5699139045.pdfIn PDF document text
- https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/csocqda4rgjiiahdtqrc3a1mu4/poxogebelatuzatufu.pdfIn PDF document text
- https://akapacha.com/userfiles/file/vefupaviluzoka.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c1200969---kodurunixitogi.pdfIn PDF document text
- http://zjqzzx.com/uploadfile/file/2021060410471573499.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b6da4c14---30500639336.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e3029d11592c0b77e19bfecd1bbbc12c/giseri.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/golasu.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e4c2c723---lanonagojirag.pdfIn PDF document text
- http://smflow.in/admin/uploads/file/62310826387.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mjkpv16vpob7v9ntcnu0vfuert/72517482024.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3ccb3a23d2092bb1f1c5660dc269e907/xizavufalalelulodibikosa.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9p55k77jsmg60j29srsbeu43e7/98102838018.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bda46n5i3h9pl63d6tku1daf2f/71231597071.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9cdcfff8706cf7ce261cd2af9e6bed0f/9671681482.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/05a3068c8ee56491c2370db4420c8723/37098614097.pdfIn PDF document text
- http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/1134221479.pdfIn PDF document text
- https://minegociomiweb.com/userfiles/file/tugipabalinutidifusudonun.pdfIn PDF document text
- https://ekransamara.ru/files/6053086807.pdfIn PDF document text
- http://kayapaliinsaat.net/file/30003162723.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/109ee905303bea7cc84b43d5094d6548/36676897405.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_off0000e66a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE66A	10976 bytes
SHA-256: `c15a7d595c516c44f493e2e2ca6256b3582baa0228422ca37e91d8f8552a402f`
`font_01_sfnt_off0000ff77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11789	17248 bytes
SHA-256: `39b0c1dc02045a53ed2b0167d9688caa4ac2778da1bcdbbb312af380bdf72d1a`

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