PDF malware analysis — malicious · 8391fddd7d6d03ca

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 18:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 5c3e31906b30f78f9454522662fe5687 SHA-1: eb6143edca10cf5dc9caa09022e600ea37b00d59 SHA-256: 8391fddd7d6d03ca441e44c281d45adc6e4450f08b7b851fbb02852cc3c6e5b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host or distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ce8787fc8a2d7e05ac28b359627fb5be/76270942434.pdf In PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1e38224544261d9e8c5839b9dfc5b6cd/67808787657.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1055901---46689133334.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160714749d4739---zajom.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5346fd65---jubiruzupuri.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c13d17c75---wozowalinodabebu.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dea70dd1---96886571098.pdfIn PDF document text
- http://mispuntossaga.com/campannas/file/32575529454.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748032d9a95---lepatoropadusagukebegolaj.pdfIn PDF document text
- http://alliusie.com/userfiles/file/39753694878.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523b466d60---vifojuru.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/58442532330.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/305d76e3968e0e6f47261828178051ea/11736149861.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e878a4ab3---ritodumejevug.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/86bfcaa666e1a7c320d7235dff75d0d3/2534475248.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/906750d118b0cd62a6b1cec89390dbe4/44077424831.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160773d6d96e49---15393129645.pdfIn PDF document text
- https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/95971308983.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/672dc7b5116e2f7c6379394f094203fe/77945538128.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895bbd78e5c---jopusojoninezedokujoze.pdfIn PDF document text
- https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/b62mn8kqva7frm6kupc9amroru/toxegiberodox.pdfIn PDF document text
- https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/repasurofogovutegupoz.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e37534458---63448998519.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnhf3kbl8c077ksgb0q3t1jno6/mebat.pdfIn PDF document text
- http://klubalfa.org/img/userfiles/file/73828237875.pdfIn PDF document text
- https://plentis.eu/ckfinder/userfiles/files/bapinewinokamijabuw.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=types+of+normalizationPDF 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_off0000e505.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE505	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fd17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD17	16760 bytes
SHA-256: `4316bee09e49ef2223116883e6c13d73f99c8bfb117e18900b2623ff74686753`
`font_02_sfnt_off000128aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128AA	10656 bytes
SHA-256: `6b41d0be1a6d8e1f60f1a6540f5cba07bfbed19763a11ee9b343a6dbfa997d6e`

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