PDF malware analysis — malicious · 7c38b22f18e4ead6

MALICIOUS

PDF

95.0 KB Created: 2021-06-25 18:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 5d13316d4fbdb4b7ef24a80aaca76791 SHA-1: 42810436782c50fe05f377bb69ea4f259e939e6d SHA-256: 7c38b22f18e4ead69a1fea260d568c5d5d53b94d5be8eb327f051b16f4c9887c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking malicious links. The presence of multiple links on compromised CMS uploads and disposable hosting further supports its role in a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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 http://akgikorea.com/file_upload/fck_upfile/file/81585592485.pdf In PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315d03be98---85598720348.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/87155013805.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608049326e896---58803848847.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f7037103---widogowokujatelu.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3932dad8---21873200553.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/af98dfa2d305903fbbb8dc3ce115ae7b/43554515178.pdfIn PDF document text
- http://toonesk.com/upload/76634391293.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/nokopijebu.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/r3l1g9m7v99hli047gq2u5dd64/nuxagawufemawixox.pdfIn PDF document text
- https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/o2k8m4j5vucnms3t1h72devu5u/82948292099.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f01170ad---7096190294.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e7e6f1fe12fa3e242feb59cf7caaceb5/wotixamaduvokutavumaviraz.pdfIn PDF document text
- http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dedizufuforadozunel.pdfIn PDF document text
- http://apluskleaning.com/admin/images/file/15497584134.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b80e7f4c332367476633adec1b38b0f7/51088878965.pdfIn PDF document text
- http://ck-kutnahora.cz/gais/image/file/8379783439.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/76136816275.pdfIn PDF document text
- https://unosms.us/userfiles/file/gagonigosusinisizupixe.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/3396803113.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c18bc277a---xepobujate.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0278585001620086489.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5848aa3c12---25340470501.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160801e4be0d32---71557220690.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7a157b9a8e440cd8a65a25ea8acc23e5/64534559066.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+mayo+for+coleslawPDF 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_off0000f808.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF808	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001101f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1101F	10552 bytes
SHA-256: `b3b1f8fa5946c3135109c1fb46deae7a465deabdc5aeb68512ab3c4a93cf126d`
`font_02_sfnt_off0001285d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1285D	18456 bytes
SHA-256: `54145ef88d135f82c92cd8a433cda314b5f7b7f729892157190e462006434412`
`font_03_sfnt_off00015904.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15904	16092 bytes
SHA-256: `9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd`

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