PDF malware analysis — malicious · c03c030fa2294d71

MALICIOUS

PDF

92.3 KB Created: 2021-07-06 13:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 1ec3e25d7e682d73023014860fbf4fdc SHA-1: 4a78dc091bb68235c54d1280d4712965b5d17930 SHA-256: c03c030fa2294d718e759026ab926c166f6c0efa472b08bed9e956fc9b23051a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to leverage external infrastructure for malicious purposes, likely as a phishing lure or to distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9786

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://coretry.ru/uplcv?utm_term=are+salamanders+cold+blooded PDF link annotation
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d46ff238fd7485ee2ec7d1f3b1eac149/48501321383.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/olc8gcsbo3rubd0kfo5dga6lv6/40072636206.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/478e4c16c769f1ac53ac853e37cc5846/58486728478.pdfIn PDF document text
- https://broodjedenbosch.nl/ckfinder/userfiles/files/xibafabuxe.pdfIn PDF document text
- http://fijiembajak.com/uploads/ck_uploads/files/gijugimufadakazet.pdfIn PDF document text
- http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/gixufebupuxulef.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/088c3deef24d650965b9ce9d2cdd09e3/muvowupav.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/lawilisofodu.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90ed31df1---muwobiwapegajupugovoja.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e25c6b6bb8b54a9d68be42a163dd9e8b/23402099057.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ragmp7jev6ua0vnkda8e8lt911/16973417247.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/bogerazug.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b37ec6875686bbc7df23bf1035b9d795/nivuniwutijebe.pdfIn PDF document text
- http://apluskleaning.com/admin/images/file/45450889198.pdfIn PDF document text
- http://fontanarosaserigrafia.it/userfiles/file/19269443601.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/fisodenatanuwapajenesowe.pdfIn PDF document text
- http://refta-bg.com/userfiles/file/5439824615.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758885a4c1d---72262075019.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a26d5257162fd31df71f970e955703a6/xepipezunopofuxa.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874715a722a---fafojabinusikesepevip.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7d3565f580bbb957e9160f7480e4fab7/72672325373.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a0930214---32693356765.pdfIn PDF document text
- http://51-lq.com/userfiles/file///gulib.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/3917869343.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v89u9p7vclu2kk5trh4c7bis36/gejoxelubiwuwitug.pdfIn PDF document text
- http://www.ecostroyservis.ru/File/20449825889.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_off0000f1d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1D3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000109e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109E4	16668 bytes
SHA-256: `eb1f3f6329a6e281dbe5187352af629341f866dee24573341818bd84feb814d5`
`font_02_sfnt_off0001219a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1219A	10464 bytes
SHA-256: `919359095c2cfc24ce90403c2261fc99067dc3e154efa9a79b34a0d2da7f753a`
`font_03_sfnt_off00013955.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13955	16248 bytes
SHA-256: `133bd5be1ed4f898dc0309614993201e6872073f44452f00aae1126e6e9351ff`

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