PDF malware analysis — malicious · 61b5c2f381342f9c

MALICIOUS

PDF

95.5 KB Created: 2021-08-12 13:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 7fda13e9988f05c2abd19273533736d5 SHA-1: c946bce6ba0bd8e08c8bf30ebe40666929903884 SHA-256: 61b5c2f381342f9cf1054c5d6c63f77e0571410f7df3485dc9ee53baa4436c31

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The 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 hosted on compromised WordPress sites, with many URLs pointing to disposable or suspicious domains. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to malicious or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9653

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d821b47b4---85147104377.pdf In PDF document text
- http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/jetumixunupolewededezofuw.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6d3bef03b079e7093e61ae0d1532b25d/4177349136.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f75984835---96901625240.pdfIn PDF document text
- https://handientu.vn/userfiles/file/19212193795.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/p3tq2c2k3dj7jik1l4m7igfd2i/warulazizonuxidax.pdfIn PDF document text
- http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/99336109112.pdfIn PDF document text
- http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/wujir.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/68839750090.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748b3965911---72023271709.pdfIn PDF document text
- http://regimhotelierbucuresti.com/images/userfiles/68309449549.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc99a0e38d---fewedotawezap.pdfIn PDF document text
- https://norservis.com/files/files/sefarida.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c797dccab1---kerafedadew.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9dc31093---45587669109.pdfIn PDF document text
- http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/58791816300.pdfIn PDF document text
- https://parokisantolukas.org/Uploads/userfiles/files/vejuwemolazutizotan.pdfIn PDF document text
- https://dodomacnosti.net/data/file/vamezafewa.pdfIn PDF document text
- http://namkhoabacninh.com/images/files/putafasojekepobodam.pdfIn PDF document text
- http://ourconn.com/userfiles/file/202108082308373579.pdfIn PDF document text
- http://skolicka.eu/foto/images/file/53344120082.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/76a13ef2d048acec592b88610e260282/9265014776.pdfIn PDF document text
- http://busanpc1.com/upload/fckeditor/file/94377116287.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/sudiwizodajuketiz.pdfIn PDF document text
- https://maxflowfans.com/userfiles/file/gijeged.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7ae7abf6e9e20cbf9d8577fa658859e7/57940512192.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fifty+shades+of+gray+full+movie+sub+indo+xxiPDF 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_off0000f77a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF77A	17064 bytes
SHA-256: `9d24fd7e9471e4f7ade3ef4980bab66f6046620091b42b5065c4595478db4ff9`
`font_01_sfnt_off00012423.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12423	11300 bytes
SHA-256: `85faf035c6b19ac57221e7c6de3faf4d4cbe74aa7c59de870948c3e8c5143188`
`font_02_sfnt_off00013e4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001565e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1565E	16204 bytes
SHA-256: `2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489`

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