PDF malware analysis — malicious · 121736ec750ccca9

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 06:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b0cad56e51197c07135dcfca946cd9b9 SHA-1: d16483914425ac47c75bcbd612b47c3afcf1238d SHA-256: 121736ec750ccca91e2c066d2f3497d35ba9ce70f2b706d9167f59957ecdbcb7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to phishing or malware-hosting pages. The heuristic 'SE_URGENCY_LURE' indicates the document may employ deceptive language to prompt user interaction.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://inwebjor.ru/uplcv?utm_term=cholera+causing+germ+discovered+by PDF link annotation
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/38b3510664f93631ab2c4557cb7fc202/wizolitapabi.pdfIn PDF document text
- http://didopack.com/files/66050936251.pdfIn PDF document text
- http://davidhammerstein.org/ckfinder/userfiles/files/15002382268.pdfIn PDF document text
- https://grupahatak.pl/admin/_fck_files/file/33260090666.pdfIn PDF document text
- http://hvpeds.com/upload/contents/file/fuzidovesezumof.pdfIn PDF document text
- http://antifftech.com/uploadfile/file///2021060805452511.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/04efe02514721f86469fde5f7526088c/15705597711.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/jesekozokofotilalajiruwe.pdfIn PDF document text
- https://tectrongim.com/uploads/files/85259298836.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1f965e811cb9ba2980ba4ef656e65678/85789334759.pdfIn PDF document text
- http://panda-es.tokyo/yamituki-n/uploads/files/11323153883.pdfIn PDF document text
- http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96731924614.pdfIn PDF document text
- http://tajesink.com/Uploadfiles/files/monuvonizunugumikoxiwe.pdfIn PDF document text
- https://masini-de-ambalat.ro/images/userfiles/zagopi.pdfIn PDF document text
- http://bouncebodysupplements.com/newerac2c/userfiles/file/17895595202.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2de4776ff---29006835949.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5af6a80956---25633126247.pdfIn PDF document text
- http://ranchobg.com/img/file/31536734206.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0077f236e1---bimazutidememu.pdfIn PDF document text
- https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/rokaz.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9069f2f0d---33611521162.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6c93d34a---34996696199.pdfIn PDF document text
- http://palezieux.com/ckfinder/userfiles/files/ruwalasoweturumud.pdfIn PDF document text
- https://khonggiansachhanoi.vn/uploads/files/23337174491.pdfIn PDF document text
- https://nbretail.com.vn/ckfinder/userfiles/files/1566643529.pdfIn PDF document text
- https://kolkatanagariksammelan.org/ckfinder/userfiles/files/parulisip.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_off0000d4e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4E1	11172 bytes
SHA-256: `9e30d8bfc856c9c6ccbf4c12c8f6691fd4bf2acd30b200a9fbb57321841b623f`
`font_01_sfnt_off0000eea0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000106b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106B2	16876 bytes
SHA-256: `91560b06acc3f3ca631e1f15b78a62bbed932fca8d1977831682e8ae9bdbe760`

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