PDF malware analysis — malicious · 5b35a08b8ee810d4

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 11:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 39bd32bdd72ef09c52d814e18e1f6774 SHA-1: ba3f57369a2d9a643993d1043861d5a292f2f4f5 SHA-256: 5b35a08b8ee810d41242f1cbb95bfb4ef9d0ddb93be77b4545db238276e11b93

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The primary goal appears to be luring users to malicious content through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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 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://dieta-plus.pl/userfiles/file/46195472483.pdf In PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607956f7389ee---66089526516.pdfIn PDF document text
- http://colescastle.com/clients/875019/File/watadujadebaze.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/af13c501d60d8e90aa8e11712fd278de/tudasos.pdfIn PDF document text
- https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/967e5924f9eaaafe0fd9d58a8f33a570/wigazeb.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ad2d52b53f88052c4196365919cdb4bb/5769145305.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ab1a6271---xifafabalin.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fiziruvolepopo.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ng9su89n4v513ednfatpnvivo7/7848084166.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a477b0cf7f---90631027089.pdfIn PDF document text
- https://xn--p3t29jo1ed4o4xw.tw/upload/files/xuvenopizof.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/51639330809.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0abf36d8---vukaw.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5599561b3---49172557543.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/dovelegufubu.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d0fb4c87---sukanuxidada.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/49078575056.pdfIn PDF document text
- https://cualuoihoanmy.com/uploads/userfiles/file/vunukutulobof.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba349bc432b---77511448335.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b5fe216d5b7f22d15dc9b0a058489415/wuvitowawopepi.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/seruviliviv.pdfIn PDF document text
- http://closehorses.com/userfiles/file/xupiwoxiz.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b3dc1fa334c542596c999536860f7c6/pumurazinotu.pdfIn PDF document text
- http://evola.it/userfiles/files/38161109563.pdfIn PDF document text
- http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/ralidokevexegozifowo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304af25ef---bolowanobedazorolabo.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/538fc64ae39e11919746190383bc1649/futazupupegivatemasepit.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=not+be+unequally+yokedPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001102a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1102A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012841.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12841	10448 bytes
SHA-256: `8b30bf41e7e88efeada10f29c633621b48c6d7ddff7b1edd0e351949b4b1043b`
`font_02_sfnt_off00013fea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FEA	16708 bytes
SHA-256: `d876b643eed36b9683f6c7406d98b0c862826bf5ceb7ffe6c5d3123355fab00a`

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