PDF malware analysis — malicious · 9720553db8eff2f3

MALICIOUS

PDF

90.3 KB Created: 2021-08-24 19:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5c54d2e78fe4a4ff7099d6cf7291f46d SHA-1: 5005b0b5bfcfd5daee61e4b2baf19b7fe4119bf2 SHA-256: 9720553db8eff2f3bf497eb8f85bada94d3700375c589c6b922af306bb76577d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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://garglob.ru/uplcv?utm_term=time+wasters+at+work PDF link annotation
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c424f58d418---vevivafudikigomuw.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/mj8mq3rt32klmohr24tv5vr0u6/pubirob.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0e32705987e014f9fb5bf17f48d06b61/12967950700.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/bapedawesefosebixiraxuz.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51a135d97a---mivegidebaxiwupu.pdfIn PDF document text
- http://fixafilm.se/userfiles/file/4803113891.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bbv9cd38n7972u83frmpu89ua4/kewerabijugoterevimojudag.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80a78147a---namowigidezeg.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tet20t3aqs3r4s8cam6e0tti15/44493034950.pdfIn PDF document text
- http://giadinhlaurenso.org/upload/files/33272961176.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/g29hnjvn3is729300nsdc55oot/tubur.pdfIn PDF document text
- https://alkirbilaw.com/userfiles/files/27478608448.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e394146a---80316555255.pdfIn PDF document text
- http://www.abcklima.hu//data/editorfile/67355670837.pdfIn PDF document text
- http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70c9ad281---suvimavojilamazifizax.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a75862b593---12200012496.pdfIn PDF document text
- https://autohausnschmidt.de/userfiles/file/bagaxajijosufaguwixakor.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/98719335604.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88f66a5cf---19207111148.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/57303200356.pdfIn PDF document text
- https://dptech.vn/uploads/files/mawutovonuvetenu.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609734a947522---64362814079.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c03d024f2---lugexo.pdfIn PDF document text
- http://parmalab.it/userfiles/files/lopokidokamowerinimef.pdfIn PDF document text
- http://autoservizimensi.it/images/fck/file/10543355798.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aad65a08e---6444934570.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_off0000e6cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6CB	3848 bytes
SHA-256: `aa9be487f0003879430b384f9410cf25a0e23fe3b871c5d1529b00b54aa4a1bb`
`font_01_sfnt_off0000f579.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF579	10260 bytes
SHA-256: `b4b1658201f9f6e15a7be45133691f32ee74fc0d3abc90722d7736cbe432ed78`
`font_02_sfnt_off00010cb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CB2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000124c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124C4	22204 bytes
SHA-256: `b7a2c157fa57b360669d46cf7802ba6e6f1ef764a8ceb3fbe9de0fd5cde715c3`

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