PDF malware analysis — malicious · c31f72f6f1bedc9c

MALICIOUS

PDF

78.8 KB Created: 2021-06-15 15:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 6cd6f391f9fa86251d169f1daa79f90f SHA-1: a9670055abfb59d1c34e889aedc7ec2d17104ad3 SHA-256: c31f72f6f1bedc9cd16ce63f189ec768b47ed32463dabfd11e082dc63e99f2e1

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.8855

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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
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://philabc.ru/uplcv?utm_term=three+kingdoms+conqueror+hack PDF link annotation
- http://geyikkimya.com/userfiles/upload/file/wusabodokinogomij.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3977075fd8421fb5692d29559f63ca0c/21553764646.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3e133069---xiriwobexixozasakovajom.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fj7cgvo4jrs7baklv9vj3g4bi6/zasotodazafezozuruwilotoz.pdfIn PDF document text
- https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/p3civo5mqr99pb5qhur23fnrfv/lefavov.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073adf8099ce---10540082828.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/57051081815.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/81jo4r3ldjuoq3du2h0ore246o/1658978897.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3da2ce98a97ea09ef5e48deba6524f63/zekawesiwomakunekedagewo.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/50a55a53da5c49f7e213206af26506f7/24261615819.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f5db54dbc0d0898a78d3c1ce15c53295/lowukivadonujek.pdfIn PDF document text
- http://splogservice.ru/content/file/82516433450.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b693579e3---7486075699.pdfIn PDF document text
- https://miguktour.com/FileData/ckfinder/files/20210611_D35F10E11CFBFC3B.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0339deb311d53eeb95aae52523689e07/10949700500.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://scripts.sil.org/OFLIn 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_off0000df3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF3E	3072 bytes
SHA-256: `882c13fa1b3f45b6f91a677fc24abffd268de8ae1d5691b4508d78b53b3e73f1`
`font_01_sfnt_off0000ea3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA3E	5460 bytes
SHA-256: `20846715d9c7bc63401d14b841f19d188f7f127124afee79e894871d3382c317`
`font_02_sfnt_off0000fca0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA0	14104 bytes
SHA-256: `5d114afdd1af10f69a8306027b21a393c1d3b12758a3821453e1e7992a6a7367`
`font_03_sfnt_off00012975.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12975	16340 bytes
SHA-256: `db2f112660f848b8dc31af8fa028be119bd5bc83b3be28adab6f608894e8eb36`

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