PDF malware analysis — malicious · ae49d4028a4b8025

MALICIOUS

PDF

96.9 KB Created: 2021-06-30 10:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b8ad434d08c70009c3d69d4f2a8328e1 SHA-1: 767d604aef1acda0719278de3cc2649d8ed58072 SHA-256: ae49d4028a4b8025ae8b390cb568a23cf3165f6247b72489d91b6c041a52418e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The primary function appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment delivery method.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://fishtech.org/uploads/userfiles/file/file/26466117431.pdf In PDF document text
- http://alnoorcity.com/userfiles/file/41608815585.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/feda730f26090aa4c3ab53db7786ad20/fudipasikosa.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb652c3b45---29662246856.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7125349450b149b528e9429be605a680/63959350593.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a95381ec8ba---lurivegizunodogax.pdfIn PDF document text
- https://djennebeads.com/nbloom/fckuploads/file/fajul.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff582c4c45---rejudibo.pdfIn PDF document text
- https://akproauto.com/nbloom/fckuploads/file/sonatiwobarupi.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/622125a37dcae98e285df94f62f641f2/8779808681.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6126c2f82e---kaxexevovituwipimeduvig.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/kijosatumapifokuj.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/mowozotebasopokifake.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3949e6e7a8b70e80db0f014fc3725c26/30994149733.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85a506343---92517234755.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db5f35b0c---mizaxizagotexigadopawufon.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0l4pnd07su5c1q5vi11625tu9s/63473719629.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a93b5152a---30832373462.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ffba257e---wegukidifotipebekuj.pdfIn PDF document text
- http://bsp-oblspl.org/ckfinder/userfiles/files/89458555347.pdfIn PDF document text
- http://vzwsportenmuziek.com/content_docs/59903012209.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/85882482239.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f067d16704---4536910449.pdfIn PDF document text
- http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/63948120660.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967c57d2687---23206848330.pdfIn PDF document text
- http://synowka.pl/galeria/file/danaropotibirowoxukaw.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mlt242bhs42ohaqt8pkdf6lggk/19033065190.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mean+taylor+swift+lyrics+and+chordsPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010684.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10684	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011e9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E9B	10768 bytes
SHA-256: `e6050b156f86f1dc337c0822dd03550ad7ddb2c1353f20035c79f607ef03171b`
`font_02_sfnt_off00013769.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13769	25024 bytes
SHA-256: `36ed83085000aca832efcd63c3886be2454873f031c1f553a6e22183ee5b35c4`

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