PDF malware analysis — malicious · 3f6860cefbceee27

MALICIOUS

PDF

87.0 KB Created: 2021-08-03 17:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 40069a184c12e6caa2f0cdfc91e30d3f SHA-1: d5b4e1bf1238a79daaa9eb5383c79b671b834ce6 SHA-256: 3f6860cefbceee27db10895620e8ce901f299e6ee447c4958d670896b5041567

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on compromised WordPress sites, suggesting it is part of a link farm designed to direct users to malicious or phishing websites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://krisoc.ru/uplcv?utm_term=how+to+prepare+ctet PDF link annotation
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6fff1ffa---buwowezexu.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea05c91561---judubetiferaxatim.pdfIn PDF document text
- http://thesnowmanicecream.com/ckfinder/userfiles/files/76254270983.pdfIn PDF document text
- http://isystemlab.com/admin/ckfinder/userfiles/files/79739967267.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3152266073f28225122d7bd10bef4a10/sobav.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/299c4f882410bacb619cb3e6d90d8e66/10690405813.pdfIn PDF document text
- https://negaratoto.com/contents//files/bagojuxa.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd88ba5e9---depofudetes.pdfIn PDF document text
- http://dangkykinhdoanhkiengiang.com/upload/ck/files/wumakiram.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac485e3d1fe---2988536254.pdfIn PDF document text
- http://greenplanetnepal.com/userfiles/file/voneloxamut.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2feh2b33u2g8c07ippih8ck1s6/56192227266.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611cd2f933---90640051679.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/71852499469.pdfIn PDF document text
- https://morganmethod.com/ci/userfiles/files/17484641282.pdfIn PDF document text
- http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/lopiwolonekul.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaca3995ea---pisubet.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u38gi9esnn34unegp382t9c2i3/pukuvovoxekizumojodav.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607621826cbb0---pogazofafozote.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160841d594fb36---fubavafunot.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e7bh27h6ja5nrih2ru56kebv6a/lavepalide.pdfIn PDF document text
- http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/mazejefisuwefijomolip.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5eui0tm2c324l153324rsbbfb3/dilaxozefisupigo.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4f09ac42---fanefojazaruputowur.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/689d3882dec26138fab3f4b3a163c3e4/27716641544.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704f637d71a---9974769359.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_off0000f421.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF421	10032 bytes
SHA-256: `eb1908354df22e392a9612ac739ff20db369bde5acb2781e79ca932179e61f67`
`font_01_sfnt_off00010a94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A94	17000 bytes
SHA-256: `275a6150c0891249e4da2efbdbd4961192e55b85ba98808e5ad74fa81463b80c`
`font_02_sfnt_off000136ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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